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That One Rule

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Proponents [of the Duckworth-Lewis method] assured us that this was the fairest way of determining the outcome of rain-affected matches. Fans without calculators and computer printouts were not so sure.
2003 Cricket World Cup highlights DVD

Games require rules. Even Calvinball has a few (You can't play it the same way twice, you must wear a mask, and you are not allowed to question the masks). Most of the rules are simple, especially in simple games, like tag. But then, there's That One Rule.

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It's the one exception, it's complicated, it can get most people arguing over how long players can stay on base without getting tagged.

Whether these rules are caused by an Obvious Rule Patch or just a bad design decision, most players (or fans, in the case of sports) learning the game will wind up confused by this rule. Particularly spectacular examples will confuse (and be hated by) advanced players.

The point here is that this is a case where most of the rules are very easy to understand except for a rule, or a few rules, that are glaringly complicated.

Differs from Loads and Loads of Rules in that this is a localized case of the problem. See also Grappling with Grappling Rules, an example from tabletop RPGs. Not to be confused with Scrappy Mechanic, which is not about a game rule or mechanic being complex or confusing, but about it being outright hated - a rule can be both overly-complicated and hated.

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Examples:

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    Board and tabletop games 
  • Chess: Castling and the en passant capture, sometimes even for more experienced players.
    • Castling is a move of both the king and one of his rooks on the same rank, the only move allowed in chess where two pieces are moved in the same move. The list of circumstances that must be met is rather long, but it's easy to determine whether all of them have been met or not. The simple version is: Neither the king nor the rook can have been moved at all; all the intervening squares in the back rank must be vacant; the king cannot move through a square where he would be under attack if he were to stop there; you cannot castle to escape check; you cannot castle into check (though you can deliver check or even checkmate); you cannot capture in the course of castling; and you cannot un-castle or re-castle.
    • The en passant ("in passing") capture is — well, it's this: "It can only occur when a player exercises his option to move his pawn two squares on its initial movement and that move places his pawn next to the opponent's pawn. When this happens, the opposing player has the option to use his pawn to take the moved pawn "en passant" or "in passing" as if the pawn had only moved one square. This option, though, only stays open for one move." If you need it simplified, it's as easy as this: "You can't use the two-square move to dodge an enemy pawn's capture zone." The move itself is well-defined; the major issue with it is that, unlike castling, it happens quite rarely. Most new players simply do not know it exists, and even a few relatively experienced players forget about it.
    • Tournament Players probably don't have any confusion about castling or en passant. For them, That One Rule is the long-evolving set of rules about when they are allowed to claim a position as drawn.
  • The board game of Go has extremely simple rules...
    • Except for the "ko rule" which is designed to prevent repeating positions. In the simplest form, it just disallows one specific position which is sufficient for 99.9% of all games. The Ing Ko Rule resolves the other .1%, at the expense of pages and pages of explication.
    • Endgame scoring under the Japanese rule set can also be problematic in certain situations, because if a group is dead in the endgame, the killer doesn't have to capture it. Sometimes, however, whether a position is dead or not is in dispute, because the position is not truly alive with two eyes, but the attacker could not capture it even in the endgame. The most common situation where this would happen is with a shape called a "bent four in the corner," which can only be captured through a ko fight, which is a bit unpredictable, and resolving ko in the endgame is a source of major rules disputes.
  • Japanese Mahjong: The rule that a hand with no value has some value. Explanation:Yaku give "multiplier" (han) points which are applied to the "basic" (fu) points of the hand. A hand with the absolute minimum of fu counts as a yaku as this is actually quite tricky to do, and is therefore a valid hand to win with. And then you add that, under some circumstances, you need more than one yaku to win.
  • Some of the mechanics of Magic: The Gathering are like this.
    • A few old-school cards have very complex rulings because they were made before making sure that there was no room for interpretation became one of the game's priorities. See for example Ice Cauldron or Word of Command. However, the absolute worst part of the rules is what happens when there are multiple persistent abilities that affect what a card can do, epitomized by the interaction between Humility and Opalescence. Witness the block of rule clarification on the interaction between those two cards specifically, as well as how many times those rulings have changed.
    • The so-called "infinity rule" is responsible for plenty of headaches. Simply put, a player cannot do anything infinitely (even if it is possible within the rules), they must declare an exact number of times. This is mostly fine, as the player can simply say "a billion" in the majority of situations, but it does get messy when both players can do something infinitely. For example, if one player can do an arbitrarily large amount of damage, and another player can prevent an arbitrarily large amount of damage, things get ugly. (Would you believe that the outcome depends on whose turn it is?)
    • The rule that disallows players from reordering the cards in their graveyards. This can interfere with effects that count cards of a certain type in graveyards, and forced players to pay strict attention to resolution order when placing cards in graveyards (for example, Day of Judgment must go on top of the creatures it destroys, while Earthquake must go under them). All this for only a handful of cards that cared about the graveyard order (Death Spark, anyone?). This is, of course, extremely annoying, particularly because most of those cards aren't any good anyways and haven't been reprinted in a decade or more. For tournaments in any format which does not include those cards (which, at this point, is most of them), ignored the rule and allows players to freely reorder their graveyards at their convenience.
    • Regeneration was considered this for quite some time, including by the developers themselves. While it was relatively straightforward in the early days of Magic and the concept was simple - pay a cost to keep a creature from dying - increasing complexity of the rules led to plenty of confusion as to how it was supposed to work. Unfortunately for the designers, it was well enough entrenched that they essentially had to work out all the details and make it work, but Word of God has said that a rule like Regeneration never would have made it off the drawing board if it were thought up today. New cards no longer use it at all - instead, cards wanting this type of effect become "indestructible until end of turn".
    • The Protection keyword ability has also historically been a source of some confusion, as it is shorthand for several distinct abilities (for something that has protection from a given category: all damage is reduced to zero, it cannot be targeted by a spell or ability, it cannot be blocked, and it cannot be enchanted or equipped). Newcomers to the game often find the mechanic confusing because it is non-discriminatory (something with Protection from Red grants protection from ALL red sources, including friendly and/or beneficial ones), and it has several notable omissions (it does not prevent "Destroy" effects, global effects, effects that produce counters, or effects that target the controlling player and force THEM to do something to the protected card). It has been somewhat phased out in modern design, with Protection cards being significantly rarer, but it does show up periodically. On top of that, there's no real limits on what something can have protection from. Colors or card types are the most common, but many more specific types of protection add another layer of confusing interpretation (for example, Emrakul has Protection from All Colored Spells, while Progenitus has Protection from Everything, and True Name Nemesis gets protection for a specific player), making it even more confusing.
    • The last time Banding was printed on a physical card was back in the 90's, and for good reason. It's widely considered the strangest and most unintuitive mechanic in Magic's long history. The basic concept is fairly simple: When attacking or blocking, your creatures can form "bands", which are effectively treated as one creature in combat from then on. All but one creature in an attacking band must have banding, and at least one creature in a defending band must have Banding, which is already strange, but tons of other questions also come up as soon as combat happens, such as: what abilities the band will or won't have, how damage from and against the band actually works, how the opponents creatures and abilities interact with their banded creature and so on. And this is without even getting into the "Bands with Other", a more specific subtype of banding with an additional restriction on what could be in the band (for example, "Bands with Other Wolves"). It used to be even worse, as well, because prior to a 2010 rules update creatures with "Bands with Other" ability could only band with other creatures that also had the same "Bands with Other" ability, not any creature that met the condition.
    • Despite being removed in a 2018 rules update, the "Planeswalker Redirection rule" continues to cause headaches to this day. In order to allow damaging abilities which were printed before Planeswalkers existed to still hit Planeswalkers, the original rule was that non-combat damage dealt to a player could instead be redirected to a Planewalker they controlled, so any spell that damage a player could also be redirected onto Planeswalkers. The fact that creatures attacked Planeswalkers directly while abilities and spells lead to a bunch of strange edge cases, but was at least functional. The new rule made it so that damaging spells and effects would directly target the planeswalkers with no redirection possible, which makes more sense to most players, but also means that many older cards had to be updated to target Planeswalkers directly. This means many, many physical cards have effects which don't actually match their text, forcing players to look it up to figure out if a specific card can or can't target Planeswalkers.
  • Yu-Gi-Oh!:
    • Summoning conditions in regards to reviving monsters. If a monster's effect says it can only be Special Summoned one way, can it be Special Summoned from the Graveyard after being Special Summoned through that method? For some cards, no. For others, yes. In the modern day, this is pretty easy to distinguish, since the former (known as "Nomis") say "Must be Special Summoned by X", and the latter (known as "Semi-Nomis") say "Must first be Special Summoned by X." The thing is, the terminology on older cards was far less distinct, and known to change every couple of years—for instance, "cannot be Special Summoned except by X" versus "can only be Special Summoned by X", which happened in a period where they were trying to formalize the definition. Go back a little earlier, and you're trying to pick between which of these two cards is a Nomi. Reprints with modern text have somewhat alleviated the issue, but there's still a lot of cards out there with text that remains outdated.
    • Some cards have text that says "ignore summoning conditions". This is clearly self-explanatory when special summoning from the hand or deck so most likely, the logic for most players at time was that if it applied to reviving it after using a Foolish Burial, then the same situation could occur, right? WRONG! According to Konami's official ruling, ever since the release of Level Modulation in Elemental Energy, a monster with a special summoning condition, whether it can be revived or not by other card effects must always be summoned properly first before it can be revived, thereby the "ignore summoning condition" clause not applying in this situation. So a monster like Armed Dragon LV7 must be special summoned to the field first if players want to revive it with Level Modulation. The fact that there is an exception to this rule is not implied on the card text, which makes the game look inconsistent.
    • The fine print on spell/trap/effect monster cards can also lead to some unusual circumstances and headaches. Legendary Fisherman on the Field while "Umi" is active? If no other monsters are on the field, opponent can attack your life points directly. Trap Card negating the effects of all monsters on the field? Monsters can still be special-summoned by their own effect, ignoring any change to ATK and DEF as a resultnote . Both of these are official rulings. Also, flip effects of monsters ONLY activate after damage calculation. A face-down defense-position monster that is attacked is NOT flip-summoned, it is merely "flipped". A handful of cards have the exact text "When this card is flip summoned..."
    • By a similar count, some costs are merely conditions to activate an effect (meaning they can't be negated), and others are part of the effect itself (meaning they can be negated). Determining which is which and how it affects your strategies can be quite troublesome for a new player. For example, take Skill Drain and Stardust Dragon: Stardust can tribute itself while on the field and negate a destruction effect, Skill Drain negates all monster effects on the field. You'd expect it to negate Stardust completely, but since Stardust's tributing of itself is a cost, this isn't negated, and then since Stardust is now in the Graveyard, its effect activates there and therefore Skill Drain does nothing to it.
    • There are cards (such as Thunder King Rai-Oh) that specify that they can negate the special summon (any summon that isn't a normal summon or flip summon) of a monster. Despite what they say, they can only negate certain special summons. They can negate anything where a monster special summons itself without starting a chain (synchro summon, xyz summon, Cyber Dragon, Black Luster Soldier - Envoy of the Beginning, etc.), but they can't negate a special summon performed during the resolution of another card's effect (fusion summon, ritual summon, Monster Reborn, etc.). This is because you aren't allowed to activate effects during the resolution of other effects. Cards that can negate any special summon have to explicitly say that they can negate a special summon or an effect that would summon a monster.
    • The missing the timing rule. There are four types of effects that activate when a certain condition is met (they take the form of "If X, Y", "If X, you can Y", "When X, Y", and "When X, you can Y"). An "If" effect occurs as long as its condition is met, and is incapable of missing the timing. A "When X, Y" effect must occur right after its condition is met, but can't miss the timing because it's mandatory. "When...you can" effects, however, MUST happen immediately after their condition occurs. Since it's not mandatory, and thus doesn't HAVE to happen, it won't happen if anything else happens in between when its condition is met and you're allowed to activate new effects. This means that if its condition is met during any link of a chain other than the first link, or if its condition is met during any part other than the last one of the resolution of a multiple-part effect, it'll miss the timing because the rest of the chain/the effect it was met during happens before you have a chance to activate it, and thus the condition is no longer correct by the time you're able to activate it. For example, if an effect can activate when a monster (let's call it monster A) is summoned by another monster's effect, but that monster is summoned during chain link 2, then you won't be able to activate it after the chain ends because link 1 happened during the small window of opportunity when you were allowed to activate the effect, forcing you to skip it. Similarly, if you activate a monster's effect that allows you to summon monster A, then do something else (such as tributing another monster), then the second half of the effect will cause you to skip past the window of opportunity, again forcing you to skip the activation of monster A's effect. Confused yet?
    • Pole Position is a good example of how an innocuous card can become a complete mess. Its effect is simple: the highest-ATK monster on the field is unaffected by Spells, and if Pole Position is destroyed, so is that monster. But what if, say, you use Axe of Despair (a spell that increases the monster's ATK) to make it the strongest monster on the field? Then it becomes unaffected by Axe's effect, which means it's no longer the strongest monster, which means Axe works again, which creates an infinite loop of the monster's ATK going up and down. To solve this, Konami has ruled that it's illegal to create an unresolvable infinite loop through card effects, but this means that Pole Position can accidentally trigger its infinite loop. The card's ruling page on the wiki is basically a comedy of errors explaining all the different situations where it can shut something down. It's the only card where the rulings for it can make it destroy itself rather than deal with the hassle.
    • Mystical Refpanel. Its effect: it can change the target of a card that targets one player to the other. Figuring out what this means will likely require another trip to the wiki. Short version: anything that draws, discards from the hand, changes your LP, or limits your actions, and that only affects one player, and that isn't an Equip, Continuous, or Field Spell, and it only transfers effect, not cost, condition, or whoever used it... you can generally tell a card falls into this when it doesn't see a rerelease, and Refpanel hasn't been reissued in the OCG for seventeen years as of this writing, despite its fairly pivotal anime appearances.
    • Necrovalley is notorious for causing problems. Its main function is to lock off the Graveyard: hence, it originally stated that it negates all effects which "involve the Graveyard", and prevents players from banishing from the Graveyard. The apparently-intended idea of this effect was that it would negate, for instance, Monster Reborn, which revives monsters from the Graveyard, reflecting its status as the central card of an archetype of tombkeepers... but the thing is, the list of effects that could be considered "involving" the Graveyard is pretty long. For instance, would a card that activates in the Graveyard count, like Sangan? What about a card that sends cards to the Graveyard, like Foolish Burial? The card is notorious for having been errataed seven times, and some of its erratas seem to describe entirely different means of functioning: for instance, any effect that affected cards in the Graveyard was negated, but currently, it's restricted to effects that would either move a card in the Graveyard to a different location, or change the types or attributes of cards in the Graveyard—and that second one didn't exist as late as its sixth errata.
  • Star Wars Customizable Card Game: "Attrition". For a vastly simplified explanation, at the end of most larger battles, both sides are assessed a penalty, in addition to the penalty paid for losing a battle, which can only be paid by discarding combatants (as opposed to discarding from one's hand or deck), which counts simultaneously toward the penalties paid by the loser. This penalty or its remainder is often waived if the characters remaining have sufficient Plot Armor, but how much plot armor is needed depends on the whole penalty, regardless of how much has to be paid by Red Shirts, and the loser's penalty remains if it's not paid by the time remaining attrition is waived, and can, if the player wishes, be paid by discarding these characters. Even in a game notorious for Loads and Loads of Rules, the complications that would crop up around this one in particular are legendary.
  • Dungeons & Dragons:
    • Before 4th edition, initiating a grappling attack was usually cause for your entire gaming group to throw large, heavy objects at you. There's a reason the trope is called Grappling with Grappling Rules. Even in later editions where it's been simplified, expect the DM to have to go look the rules up to actually resolve your attack.
    • Subduing dragons in early editions required the GM to recalculate what percentage of the dragon's HP you had burned through with non-lethal damage and then make percentile rolls. Worse, it basically amounted to giving a rampaging, roaring engine of death a blanket party and hoping it decided to cry.
    • Attacks of Opportunity/Opportunity Attacks started out like this in Third Edition, so each successive edition of the game has mostly scaled them back. The basic principle behind them was simple and understandable: In a game that uses turns for simplicity instead of real-time, there should be some kind of restriction against a character abusing the turn-based rules to simply bypass a whole group of defenders to take out a weaker target, steal an object, etc. The problems occurred with both confusing terminology and an "everything but the kitchen sink" approach as more situations were added to what could trigger an Opportunity Attack. The former described this as a situation where the trigger creature lowers their defenses, but a more accurate description would be a situation where the trigger creature lowers their counter-attack offense: i.e., you can take a free swing at them because you're not worried about leaving an opening for them to swing back at you. The latter issue combines with the first issue confusion to where using an action triggers an attack even though the condition where the action was made isn't changing regardless of the action. To explain, why does attempting to stand up from prone trigger a free attack but simply lying helplessly prone does not, or attacking someone without a melee weapon in hand (e.g., crossbow or punching) triggers an AoO but simply standing there unarmed doesn't?
      • Fourth Edition reduced the circumstances to just attempting to move past a creature or use a ranged attack next to them, although oddly giving the defender supposedly unlimited attacks as long as it was against a new target, and Fifth Edition reduced this even further to just moving past the defending creature completely, as you can still circle around an opponent. No edition has brought up the concept of removing your ability to use AoO if other enemies are engaging you (e.g. if you have five creatures engaging you, how can you possibly get a free swing at a different one?), but most likely is due to the rules getting just too complex at that point.
    • In third edition DnD, (and, by extension Pathfinder) most DMs just have monsters and NPCs die when they reach 0 hp or lower rather than tracking their hp (the rules officially state that characters don't die till they reach -10 hp or the negative of whatever their constitution score is in Pathfinder), mainly because it is both a hassle and creates some moral quandaries, as killing an opponent who is already unconscious and bleeding to death doesn't seem very heroic. The big exception being monsters in Pathfinder with the Ferocity ability (which lets them remain conscious and keep fighting till they are reduced to negative con hp).
      • Pathfinder second edition (which removes negative hp and just has a character fall unconscious and have to make saving throws to avoid dying) explicitly says that monsters and NPCs should just die when brought to 0 hp, unless it was due to a non-lethal attack.
      • Fifth Edition, which doesn't have "nonlethal" damage as a rule at all, simplifies this to just stating that whoever deals the damage which reduces a monster/NPC to 0hp can simply declare they are knocking them out rather than killing. Of course, this is still subject to DM arbitration as to wether this is possible given the way the damage was dealt (like with an area-effect fireball)
  • The 3rd edition of Nobilis introduced a system for resolving non-miraculous actions by mortals that is a bit confusing because it focuses not on immediate success or failure but the effect that taking such an action has on your life. (e.g. Achieving long-running goals, impressing people, making your life better, doing "the right thing" etc.) Handling task resolution at this level is hard to wrap your head around, but it's mitigated by the fact that most mortals don't have the "oomph" to regularly get really high on the scale. Normally. However, Nobles can do so trivially with Aspect miracles, and the "Shine" trait gives an extra push up the chart for mortals doing something a Noble tells them to do.
  • Draws are exceedingly rare in Shōgi, Japanese chess. However, they can occur under the right circumstances where both players are able to surround their king with promoted pieces. In this case, the winner is decided by counting all of the pieces owned by each side, with a point value for each (5 points each for bishop and rook, one point for all others). If both players have at least 24 points, it is a draw. If not, the player with more points wins.
  • Diplomacy is normally a relatively simple game - there are four basic moves and rules for resolving their interactions - except that convoys, where an army moves between locations using a chain of naval units possibly owned by another player, are notorious for creating problems. This began with the discovery that a player could convoy another player's army without their knowledge or consent, and continued into situations creating actual paradoxes. For example, an army which travels via a convoy to displace another army which is cutting the support of a fleet which is attacking the same convoy; if the convoy succeeds, the support is not cut and the convoy defeated, so it ought to fail; but if the convoy fails, the support is cut and the convoy survives, so it ought to succeed. The tournament rule book at one point simply abandoned any attempt at making sense and spent several pages presenting a humanized version of the source code of the automated resolution system.
  • Bridge
    • In tournament and club play, there are procedures for dealing with a board that cannot be scored for any reason at one or more tables. These are mathematically complex, and can result in a pair not involved having its score reduced - for example, a pair that might otherwise have gotten 10 out of 10 on that board will now get only 9.9. This is disliked both by new players (who don't understand the calculations involved) and by experts (for whom that small adjustment can have an impact on their placement).
    • The scoring procedures for a fouled board (where cards got moved between hands somehow, so that not everyone played exactly the same hand) are even more complicated; fortunately, this comes up very rarely.
    • The rules for a revoke (playing a card of a suit other than the first suit led when following suit is possible) are a bit baroque and have resulted in numerous appeals at clubs and events. The rules state that up to two penalty tricks may be awarded to the aggrieved side - one for the trick where the revoke happened, and one for the trick when the revoke card (the one that should have been played on the revoke trick) finally gets played. However, this is only supposed to apply when both the aggrieved partnership lost both tricks in question and it's deemed that they would have won the tricks in question if play had progressed properly (for example, if the aggrieved side would have won the revoke trick regardless, they wouldn't be eligible to receive a penalty trick for that trick). Arguments about how play would have progressed differently can result in much hair-splitting over penalty tricks rewarded, and that's even before getting into the issue of how many people (including directors, at clubs and tournaments) argue that there should be a two-trick penalty regardless. Some players will just Hand Wave the two-trick penalty rule as being hard-and-fast just due to not wanting to deal with hashing out how things should have gone.
  • Brass has the Liverpool-Birkenhead virtual link. It allows a player who has a presence in either Liverpool or Birkenhead to build in the other location using industry cards instead of city cards. While the intent was to make it harder to lock players out of the Port spaces in Liverpool or the Shipyard spaces in both cities it ended up confusing a lot of players. The game's creator later changed the rule so that the virtual link could only be used to build a Shipyard in Birkenhead and in the latest reprint the virtual link was removed entirely since it was generally considered superfluous.
  • The Final Fantasy Trading Card Game has a couple of things which trip up both new and veteran players:
    • Combat has the following phases: Combat Preparation, Combat, Combat Resolution. It seems straightforward: you prepare for combat with effects, you choose a Forward to attack, if your opponent has a Forward that can block, he chooses which one will block (if any), and then combat resolves with the Forwards dealing damage to each other or, if the attacker is unblocked, to the opponent directly. But there's subtleties that can escape players:
      • Once you go into Combat Preparation, any effects that occur when you enter combat trigger and can't be stopped by removing the Forward with the ability. You would have to do so before Combat Preparation occurs, meaning you'd need to do so before you even get to the Combat Phase for that turn.
      • Once a Forward is attacking, it's attacking, and while the opponent can get rid of the attacking Forward with a Summon or Ability, effects that occur when a Forward attacks would still go off. Getting rid of the attacking Forward at this time prevents damage from being dealt to the opponent.
      • Similarly, once a Forward is declared as a blocker, it blocks the attack. Unlike attacks, removing the blocking Forward would not cancel the block or let the attacker through.
      • Forwards also attack one at a time, which for anyone that's played other card games, can trip them up, since simultaneous attacks are the norm. Combat Preparation, Combat, and Combat Resolution repeat for each attack.
    • EX Bursts are effects that occur when you take damage: when you take damage, you flip the top card of your deck. If it has the EX Burst logo, the EX Burst effect occurs immediately without having to pay the card's cost. What trips players up with it:
      • EX Bursts are not mandatory. If an EX Burst is flipped up but the player who took the damage decides they're better off not using it, they can choose to ignore it.
      • EX Bursts do not use the normal method of effect resolution. Once an EX Burst is triggered, it occurs immediately, must resolve before anything else does, and cannot be responded to.
      • Because EX Bursts must resolve before anything else does, they can circumvent certain effects. Effects that prevent a card from being chosen by a Summon or Ability can't be circumvented, because EX Bursts are considered those for play purposes and those effects prevent you from even selecting the card in the first place. However, effects that occur when a particular card is targeted can be circumvented due to the rules for EX Burst resolution. For example, Ashe is a 7000 power Forward that gets +3000 power whenever an opponent's Summon or effect targets her. If you played a Summon on her that did 7000 damage, the +3000 power boost would kick in and prevent her from being broken (destroyed). However, if an EX Burst did 7000 damage to her, she would break immediately because the EX Burst must resolve first, and thus her power boost never gets a chance to occur.
      • What really trips players up though is the "cannot be responded to" clause. Once an EX Burst happens, nothing else can be done. If an EX Burst which would break a Forward is turned over, the Forward's controller can't use an effect to save the Forward at that instance. Judges at high-level tournaments have had to remind players that EX Bursts can't be responded to.
    • Targeting rules are tricky, particularly because of how the game's effect resolution work. When Summons or Abilities are used, targets must be valid prior to the effect even being paid for, otherwise the play is not legal. Comes-into-play effects however differ because those effects don't occur until after the card that has the effect enters the field. For example, Lenna has two effects: when she comes into play, you can choose a Forward of cost 2 or less in your Break Zone and put it into play for free. She also has an effect that lets you choose a non-Light or Dark Forward in your Break Zone and put it into play. For the first ability, if the cost to play Lenna is paid at least partially through discarding cards to generate Crystal Points (the in-game resource used to play cards, which are gained either through "dulling" (tapping) Backups or discarding cards in your hand), you can choose one of the cards you discarded provided it fits the limitation because by the time the ability is added to the stack, the discarded card is in your Break Zone and thus a valid target. For the second, you cannot choose a card you discarded to pay for her ability because it was not in your Break Zone at the time and you must choose a target prior to paying for the ability.
    • Rules for break (destroy) effects have nuances that are not readily evident for Forwards. When a Forward takes damage equal to or greater than its power or is chosen by an effect that says to break a Forward, the Forward is broken and put into the Break Zone (discard pile). Some Forwards have restrictions on what can or cannot break them. Galuf from the Opus VII set for example can't be broken at all during his controller's turn, and Vincent from Opus II can't be broken by effects that don't deal damage. However, there are two ways of getting around those. If an effect removes a Forward from the game, it gets around break effects because removing from the game is not the same as breaking. Similarly, if an effect is worded that you "put" a Forward into the Break Zone, that does not count as breaking the Forward either. Reducing a Forward's power to zero makes the Forward's controller "put" it into the Break Zone, so that doesn't count as a break effect either. So for the aforementioned Galuf and Vincent, removing them from the game or being forced to "put" them into the Break Zone gets around their break restrictions.
  • The combat resolution system in the Legend of the Five Rings CCG was almost universally regarded as its biggest flaw- both armies totaled up the Force of their unbowed cards present at the battlefield and the army with lower Force (even if it was only by one point) was destroyed completely, while the winner lost nothing. While both players could still suffer considerable damage in battles from ranged attacks, duels or other effects, this still led to a lot of games that would be entirely decided by a single "all-in" battle where the loser lost their entire army and were helpless to resist further attacks (or counterattacks) from their now-unopposed enemy. The "Yu" trait (which forced the opponent to sacrifice cards when the personality with Yu was destroyed) was added to the game specifically the counteract this, and spinoff game Legend of the Burning Sands used a different system which caused both players to take losses, but it always remained a sticking point.

    Sports 

American Football

Most such rules are buried in the rulebook until a controversy uncovers it (e.g., the Tuck rule, the "ineligible receiver" rule), or through subjective over-enforcement (e.g., "Defenseless Player" or "Roughing the Passer" rulings).
  • The Calvin Johnson rule, which states a ball cannot be considered a catch if the receiver loses control of the ball going to the ground. Since the 2014-2015 playoffs, it became unclear among the general public on what a catch is, which led to fans saying, "What is a catch?"
  • The "targeting" rule recently added in college football. If a defensive player hits an offensive player in the head or neck area and is deemed to have been "targeting" a player (i.e. having intended to hit him in the head or neck area), a 15-yard penalty is assessed, and the player is ejected from the game (and suspended for the first half of his next game if the infraction occurred in the 2nd half). One problem is that this call is always reviewed, and if overturned, doesn't involve any penalty at all, even if the hit was still clearly unnecessary roughness. Then there are the borderline hits where a player was launching himself at another player's midsection, often in an attempt to avoid this very penalty, but that player ducked or dove and got hit in the head instead. While the NFL does have a similar penalty, officials can use their judgment to not eject defensive players when the contact was clearly incidental, and can flag offensive players for lowering their heads into contact, unlike in the NCAA where the foul carries an automatic ejection regardless of how unintentional the contact was and there is no offensive equivalent.
  • One example by obscurity is the "Fair Catch Kick". A team receiving a kickoff can call a fair catch and immediately try a free kick-style field goal from the spot of the fair catch. To say the rule is rarely utilized is an understatement: It's only been used 24 times (that we know of) in the NFL, and was last used successfully in 1976.
  • The increased quarterback protection rules have come under intense scrutiny in recent years, in the same vein as the targeting rule. The idea of it is to protect quarterbacks from unnecessary late hits by ensuring players can only hit the quarterback before he throws the football on a passing play, or immediately after the quarterback releases, when the defender is already in the process of the tackle. However, "immediately after the quarterback releases" is subject to the judgement of the officials. This leads to instances where defenders didn't make an attempt to tackle a quarterback, believing he had thrown the football, only for the quarterback to make a large gain, as well as defenders getting flagged on what many found to be clean, legal hits, culminating in a pair of "Roughing the Passer" penalties in the AFC Championship game, in which Tom Brady had his shoulder dusted and Patrick Mahomes was grazed below the knees by their would-be tacklers.
  • Defensive pass interference rules have been contentious for many years. If a defender interferes with a receiver trying to catch a pass, the ball is placed at the spot of the foul (or the one-yard line if it happens in the defending team's end zone) and the offense is given an automatic first down. This can, and with some frequency does, become the most lethal penalty in the entire game, as DPI on a long pass play may produce penalties in upwards of 30 yards. Even a personal foul (which is handed out for dangerous or overly aggressive behavior) is a mere 15 yards and fresh downs. Fans tend to hate the severity of the penalty, and some voices are always calling to make it a set penalty of 15-20 yards, but even those who hate it tend to admit there is a good reason for it being severe (without it, defensive backs would have little incentive to *not* interfere with passes longer than 15 yards). There are also more than a few fans who are okay with the penalty if the interference is blatant, but feel that given the severity of the penalty, the referees need to be very selective about when to call it, and will get upset if the penalty is called in a situation where the offense is minor or questionable.
    • Note that in college and high school football, the penalty is a maximum of 15 yards regardless of the location of the foul. In high school football only, DPI is not an automatic first down, though this is mostly a non-issue because the foul will cause the ball to be advanced, often resulting in a first down.
  • Starting in 2011, the NFL changed its overtime rules. The winner of the coin toss can win the game by scoring a touchdown on an opening drive as opposed to straight sudden death. Any other result means the opposing team gets possession of the ball. Thanks to the coin toss, an otherwise exciting game can wind up being a Luck-Based Mission in overtime. If a team wins because of an opening drive touchdown, then this means the opposition never got a chance to possess the ball. Overall, this has happened seven timesnote  and each call to fix the current overtime rules becomes louder than the last.

Association football (soccer)

  • The offside rule. The rule is of course very straightforward (basically, if you were behind all the defendersnote  when the ball was passed to you, the move is ruled illegal and the defending team gets a free kick); it's just tediously worded and has a reputation for being so complicated that newcomers declare themselves confused without even trying to understand, and those who understand it feel the need to explain it in as complicated and detailed a way as possible. This in turn gets people annoyed. The complications and special circumstances that move it into The One Rule territory are:
    • You can't score if you're behind all the defenders but one, with the goalkeeper counting as a defender. This only matters when the play has gone past the defending goalie, but there's another defender between the player who got the ball and the goal. Which is to say, hardly ever.
    • If you were behind the ball when it was passed to you, you're onside regardless of where any defender was.
    • The same is true if you were in your own half of the field when it was passed to you.
    • Every offensive player is onside during a corner kick, goal kick, or throw-in until the ball is first touched by a player.
    • Sometimes, an offside player doesn't even need to touch the ball in order to be offside, which happens if he is interpreted as being involved in the play in some way (like letting the ball pass through his legs or blocking the field of vision of the goalie).
    • The rule isn't just difficult to explain, but even more difficult to enforce. To call someone offside an official must keep track of the position of the ball, the position of the defending player(s) and the position of the attacking player(s), all of whom are in motion. In close situations offside calls are essentially arbitrary and without any ability to use video review on calls the offside rule in Soccer essentially becomes a Rule Zero that officials can use to put their own stamp on the game.
      • However, in major league games, there are two line referees, who move along the side lines of the field, always at a position where they can accurately detect an offside. Communication with the main referee is performed via wireless headset nowadays. (They are also responsible for reporting when the ball leaves the field, and they can also report fouls.)
    • The offside rule in association football can be considered an artifact from the older football codes it evolved from where there exists a well-defined line of scrimmage. The problem came with attempting to adapt the same concept to a free-flowing sport with no stoppage of play. The more common solution is to use a fixed "zone" based offside system.

Examples of the Offside Rule within works

  • The inability of anyone to explain the offside rule is parodied in The Little Book of Mornington Crescent. The explanation of Mornington Crescent's offside rule is half a page of dense, jargon-filled gobbledegook. Which concludes "This should not be confused with the offside rule".
  • The Brazilian championship of soccer had the tradition of always changing the formula. Sometimes yearly (and if a big team was meant to be relegated, there would be an Obvious Rule Patch to keep it in the top level). In 1999, the relegation was similar to an Argentine rule, based on the average points between 1998 and 1999. But it got worse when a team who suffered a last-minute downgrade started a lawsuit...
  • The first "Mr Blobby" based "Gotcha Oscar" on Noels House Party (a Candid Camera Prank based around a fake [and entirely unworkable] kids' TV show, thereby removing the need to hide the cameras) was footballer Garth Crooks trying to teach Mr Blobby how to play The Beautiful Game, including an increasingly confused explanation of the offside rule. Some time later, an entirely unrelated skit about the Crinkly Bottom football team would claim that Mr Blobby was their coach, and still didn't understand it.
  • "An American Coach In London" featured Ted Lasso voicing his frustrations with the training official.
    Ted Lasso: "WILL YOU EXPLAIN TO ME HOW THAT WAS OFFSIDE!? ...no, I'm asking you seriously, explain offside to me.

Australian Rules Football

  • The advantage rule, which is also used in soccer. (Ice hockey also has a similar rule called the "delayed penalty".) The officials are given the ability to wave off a foul if the team that was fouled would be in a more advantageous position if the foul isn't given — in footy, you'll often hear the announcers call "play on" when advantage is paid. Of course, because the rule is a matter of high-speed interpretation, fans on both sides of an advantage call will often be puzzled — if not downright angry — about the call. The loudest yelps will be given if the team that played on immediately loses the ball after the advantage call, as their fans now believe they were victimized instead of helped. It's far less controversial in soccer and ice hockey because in those sports, change of possession is far more common and expected. What's more, in soccer, the team that was fouled gets the ball for a free kick; ice hockey gets a faceoff instead, and the team that fouled has one less player on the ice, so in both of those sports the advantage rule rarely benefits the opponents.

Baseball

  • The infield fly rule. This rule is simpler than its reputation — an infielder can't deliberately let a fly ball drop in order to get an easy double play by picking off runners who would otherwise be forced to advance.note  If there are runners on first and second base or the bases are loaded, there are less than two outs, and the umpire feels the ball would be caught with "ordinary" effort by an infielder, the batter-runner is automatically out and all force outs are negatednote . The reason why the rule requires a runner on both first and second (or bases loaded) is that, if there were just a runner on first, because the batter is running to first as soon as he puts the ball in play (assuming he didn't just give up in disgust), it is assumed that he would beat out any double play attempt if an unscrupulous fielder tried to get them bothnote . Whether or not the fielder catches the fly ball, the net result is the same: one more out and a runner on first. It is possible that the team on defense would prefer to have one over the other be called out (i.e., one of them is a better base-stealer), but such strategic use of outs is outside the umpire's concern.
  • The balk rule. The simplest explanation is that a Balk is the rule against a pitcher pretending they're going to throw a pitch without actually doing so. Simple enough in concept, but hard to actually define and call. A pitcher can't act like he's throwing a pitch and then throw to first base to pick off a runner, which is why when trying to pick off a runner, the pitcher will almost always move their front leg towards the base. Balks can also be called when a pitcher motions toward one base but throws to a different one. The problem is, how do you classify a "motion"? Is it when the pitcher starts his windup? When he lifts his leg? When he moves his arm? There's also the issue of what counts as "towards" a base- if a pitcher starts moving in a direction between home plate and first base, for instance, which base is he throwing to? Balks are almost always controversial at the Major League level as they are the third-most common cause of ejections after balls/strikes and checked swing calls. Balks can also be called for similarly deceptive moves by the catcher. And there's some other things that count as balks, too- it's also a balk if the pitcher motions towards a base like he's going to throw but doesn't throw, if he starts making a throw without first fully coming to a "set" position, if he throws to home plate while his foot isn't on the pitching rubber, or, well, a lot of other things. There's even a few ways to balk that are clearly completely unintentional, like tripping and falling off the mound or dropping the ball.
  • Determining if a pitcher is intentionally hitting or trying to hit a batter. For obvious reasons intentionally hitting an opponent with a 95-mph[[labelnote:*]]153 km/h[[/note]] projectile is against the rules, but at the same time the whole point of the game IS to throw said 95-mph ball NEAR your opponent, meaning that they sometimes do get hit by accident. Pitches "getting away" does happen, and some pitchers have even been ejected after losing balance on the mound. When the rule isn't enforced, pitchers who escape punishment on the field sometimes push their luck by taunting their opponents or casually admitting intent in post-game interviews. Then there's the option to warn the benches if the umpire isn't convinced, which usually translates to the pitching team getting away with a free shot. Warnings are assured to result in arguments from the team whose player got hit, leading to managerial and coach ejections in most cases. Even still, with teams facing suspensions for hitting a batter with warnings in place, an umpire can still declare no intent even if it's blatant. It got worse in 2020 after MLB feared retaliation against players who took part in the Astros' sign-stealing scandal. Decisions now require a crew conference, further hampering the league's attempts to improve the pace of play.
  • The runner's lane interference rule. The batter-runner can be called out if he interferes with a throw that would have resulted in a play at first base. First base is in fair ground, and the runner's lane leading there from home plate is in foul territory. The runner has to divert from the lane to step on the bag by avoiding contact with a fielder while not straying from the base path too much. The most common complaint about this rule is that if a throw is wild or at least uncatchable, then it rewards bad defense by turning an error into an out. It also invites a situation where the fielder can induce an unavoidable collision at first if he sets up to catch the ball in foul territory. In this case, the umpire could overrule an obstruction call in favor of runner's lane interference if the fielder was in a position to catch the ball regardless of the throw's accuracy. Fans have offered suggestions on how to improve this rule, such as putting another base adjacent to the one already there in foul territory as seen in softball or the recently created Baseball5 variant.

Basketball

  • The NBA once had a technical foul for "illegal defense". Zone defenses were disallowed, since it allowed centers to simply camp under the basket. After a few years without this rule, they decided to make a rule that disallowed defensive players to be in the key (the painted area directly underneath and in front of the basket) for more than 3 seconds... which matched up nicely with the same rule for offensive players.
  • Traveling comes up a lot, both among casual and dedicated fans. Essentially a player is only allowed two steps after they stop dribbling, or it is a Travel. If they come to a complete stop, one of their feet must remain planted while the other can move. Of course when exactly a dribble is over and what counts as the players two steps immediately becomes quite subjective and hard to call. In recent years the NBA and International Basketball Federation have changed their travel rules to allow for a "Gather Step", which is its own can of worms, especially since many other leagues like the NCAA (college basketball) don't allow for this additional step, meaning that a travel in one league isn't in another.

Cricket

  • The Duckworth-Lewis–Stern (DLS) methodnote  was devised as a totally fair way to decide matches affected by rain. Unfortunately it's an extremely complex mathematical formula the results of which change every time a ball is bowled, a run is scored, basically every time anything at all happens. Since its introduction, matches (one of them famously a World Cup semifinal) have been decided by one team's players and/or coach misinterpreting the results table and settling for fewer runs than they in fact needed. There are those, of course, who argue that the whole of cricket is in fact a case of Loads and Loads of Rules and it's difficult to deny... but DLS is infamous even among those who understand everything else perfectly.
  • The LBW (Leg Before Wicket) rule: "A batsman is out if he is hit by a legal delivery, which is not pitched outside the line of leg-stump, has not hit the bat and is going on to hit the stumps. If it strikes the batsman outside the line of off-stump he is not-out PROVIDED he was playing a shot at the time." Simple, no? ...No, not in practice. While the spirit of the rule is simple enough (if the ball missed the bat and the batsman's leg is the only thing that stopped the ball hitting the stumps, he's out anyway) where the ball was actually going to end up can be hotly debated. Recent use of infrared and computerised video replays to follow the line and trajectory of the ball has made it much easier for spectators to see if the decision is in fact out. note 

Examples of LBW within works:

  • In Stephen Baxter's Time's Eye, British soldiers from colonial-era India try to explain cricket to the army of Alexander the Great. They manage to get most of it across with gestures and broken Greek. They give up trying to explain Leg Before Wicket.
  • In SF Debris' review of the Star Trek: Voyager episode "Persistence of Vision", a vision of his disapproving father asks Tom Paris several difficult trivia questions, which Tom successfully answers, until he asks him to explain the Leg Before Wicket rule, which Tom fails to do, causing the vision to dismiss him as useless.

Fencing

  • "Right-of-way" (also known as "priority"): Another of those rules that are simple to explain, but complex to deal with. Simply put, you cannot score a point unless you are the one attack, you must stop an incoming attack or remove the threat first to gain right-of-way, then you can counter-attack. Of course considering how fast fencing is, it's far, far more complicated in practice, involving as it does questions like "What constitutes an existing attack?", "What constitutes "stopping the existing attack"?" "What qualifies as "removing the threat"?" and "What the hell just happened, it was all so fast..."

Examples of Right-of-Way within works:

  • In Robert Asprin's Phule's Company, during the fencing match between the Red Eagles and the Omega Company, Phule gives a brief explanation of right-of-way to the audience prior to the beginning of the match. They are okay with it during the foil bout. confused and angry about it during the sabre bout because the Omega Company fencer loses points to it all the time (he's not a fencer at all, but an escrima fighter, and he's clearly landing attacks that would work in a real fight, but violate right-of-way), and when he announces the epee bout, they cheer when he tells them that epee doesn't use right-of-way at all.
  • Stop hits and time hits in fencing are in theory incredibly simple, as they are counterattacks which obtain priority over the initial attack (thus escaping falling afoul of right-of-way) because the initial attack is too "long-winded" and so it was interrupted. For example, if A's attack is legal, but consists of four movements, B can stop hit A by counterattacking during that fancy, silly wind-up. Good luck with getting fencers and judges to agree on what is a stop-hit and what doesn't count in the heat of swift-moving competition.
  • However, epée fencing averts this situation entirely—it has NO priority rule at all. If two fencers record hits within the margin of error in electronic scorekeeping (40 milliseconds), both earn a point.

Ice Hockey

  • Buffalo Sabres fans are the only hockey fans that know the rules on players in the goal crease, the result of Brett Hull scoring a controversial Cup-winning goal off his own rebound in the third overtime period of Game 6 of the Stanley Cup finals in 1999. Video replay showed that Hull's skate was in the crease (i.e. the area in front of the goal, reserved for the goalie), which the Sabres argued was a violation of a rule then in effect that disallowed goals if an offensive player was in the goal crease. However, the rule stated that a player can enter the crease, as long as he has control of the puck, and the refs ruled that since Brett's shot rebounded to him, he had never lost control of the puck. Following that season, the rules were changed so that the player could now be in the goal crease, as long as they do not touch the goaltender. This led to some angry goaltenders as opposed to some angry Sabres fans.
  • The NHL has a few rules that vie for the title. The consensus champion, though, is the "puck-over-the-glass" rule. Specifically, following the 2005 lockout, the NHL made it an offence to shoot the puck over the glass from the team's defensive end, netting the offending player a two-minute penalty for delay of game. It's suspected the rule was implemented to boost scoring by boosting penalty minutes (since teams on the powerplay score more), but it does so by penalizing something that is usually an accidental action and which causes no more of a delay than icing the puck (which is not a penalty). Few things are more frustrating than watching your team take one of these penalties (even worse, because icing is legal while on the penalty kill and many players try to bank the glass off the puck and out, this penalty usually gets called on teams already down a man, leading to a 5-on-3 penalty).
  • Icings are easy to spot and deal with. Conversely, icings are hard as hell to accurately explain (at least until the rule was changed). Then there's "Hybrid icing". Intended to reduce injuries, it says if a defender is closer to the puck than any member of the opposing team at the faceoff circle, icing is called immediately. Problems arise when you consider that a forward and defenseman will almost always be skating towards the puck at different angles, making it difficult to properly assess who's closer to the puck and leading to controversial calls. There's also the fact that a fast forward could still beat out a defender at that point, resulting in offensive opportunities being lost.
  • For a solid 62 years (1943-2005), the NHL had a "Two-Line Pass" rule, stating that teams could not pass across more than two solid lines at a time (e.g. a blue line and the halfway line), so as to prevent home-run passes out of the defensive zone to a player breaking behind the defense. While teams learned to play around it, it ultimately led to more stagnant games, as defenses would clutter up the areas these passes needed to go through, forcibly preventing goal-scoring opportunities in a tactic known as the "neutral-zone trap". Fans hated it, and it would result in low-scoring, boring hockey games. Once the rule was changed to prohibit only those passes that crossed both blue lines, allowing passes to come from more parts of the ice, defenses had to account for all parts of the ice, making the sport more dynamic and far more interesting to watch.

Motorsports

  • NASCAR has several recently-introduced rules that raise the ire of long-time fans:
    • While the Chase for the Cup was divisive for attempting to artificially induce Down to the Last Play finales to seasons, it still had its fans. However, its replacement elimination "playoff" format has been widely criticized. Drivers lock their places into the 16-car field by winning a race, with one spot reserved for the regular-season champion, meaning that mediocre teams and drivers that luck into a win are rewarded for it with a playoff spot even if they finish poorly the rest of the year, while teams that lack wins but are otherwise consistent can end up missing the playoffs if they don't accumulate the most points during the regular season. That trend continues in the playoffs themselves, with subsequent "rounds" where the number of drivers in the field is reduced by half and drivers move on to the next round by winning, resulting in the last four drivers battling it out in a winner-take-all contest in the final race of the season. This effectively ends up resulting in drivers having their seasons ended by things that were entirely out of their control such as being caught up in wrecks, and has been criticized for making drivers who need the win to advance pull risky and dangerous moves in order to get there, leading to conflicts and bad blood. In fact, there have been two separate incidents where drivers have been eliminated from the playoffs after being intentionally wreckednote . Fans note that this system is one in which wins are paradoxically the most important thing and don't matter at all; theoretically, if a driver wins the first 35 races in a season but wrecks out of the final race early, he could end up finishing fourth in the final standings.
    • Stage racing has drawn backlash from fans since it was introduced in 2018. Basically, each race is divided into three segments called "stages", where a caution is flown after the completion of the first two and the top 10 drivers get bonus points. While a lot of fans will admit they're not against the principle of drivers who are in the lead early getting some bonuses, the main point of criticism comes from the fact that the mandatory cautions at the end of stages end up oversimplifying pit strategy and destroying the flow of green-flag racingnote . There is also an issue where the stage cautions, which are the same amount of laps no matter where, eat up much more racing time at road courses, which are longer than most oval tracks and have fewer laps because of that. Compounding these gripes is the competition caution rule, which states that if a race is run on a track that has recently had rain, NASCAR will throw a caution early on to allow teams to make adjustments. Combined with the stage racing rule, this can mean that a single race can have up to four mandatory caution periods. Unfortunately, stage racing isn't likely to go away, since the stage cautions provide ready-made commercial breaks.
    • As hated as stage racing is, its predecessor, the caution clock, was even more despised. This rule stated that a caution would automatically come out after twenty minutes of green-flag racing, effectively making fuel mileage races impossible, unlike with stages where it's merely hard to do. If stages dumbed pit strategy down, the caution clock effectively eliminated it. Fortunately, this rule never made it out of the truck series before it was dropped.
    • The yellow-line rule at Daytona and Talladega is widely considered one of the most arbitrary and useless rules in the series. The rules state that drivers cannot advance their position if any of their wheels go under the yellow line that delineates the track from the apron, except if they are forced beneath it; however, what counts as going beneath the yellow line and being forced under have never been made clear, and the rule is often enforced in wildly disproportionate ways. Many fans outright call for this rule to be abolished, considering it exists at no other tracks but the aforementioned two.

Rugby

  • "No forward passes" is an integral part of both codes of rugby (and one of the key mechanics separating the game from North American gridiron), but casual fans - and even some long-time fans and commentators - have been confused by passes that travel forward, but are ruled as "flat" or "backward". This is because the laws take into account the effect of the player running forward while releasing the ball (sometimes called "the Momentum Rule"). Even if the ball is caught further forward from where it was released, the pass isn't forward as long as the player doesn't propel the ball forward. This misunderstanding is common enough that World Rugby, the governing body for rugby union, released a video clarifying the issue.

    Video Games 
  • In World of Warcraft the armor penetration stat ended up so confusing and defining some classes to such a degree that in the Cataclysm expansion, it was removed from the game entirely. Armor penetration was of course distinct from but interacted with abilities that reduce enemy armor, abilities that bypass enemy armor, and amount of enemy armor. And you needed to calculate all this to know with what gear and on which fight armor penetration became better than attack power (though by the end of the expansion it became stack armor penetration, always).
  • Early games in the Super Robot Wars franchise included a stat called "Limit". Intended as a nod to Mobile Suit Gundamnote , Limit would throttle a character's Accuracy and Evasion if they were too high for the machine they were using, forcing the player to spend extra upgrade money just to make machines perform as they're supposed to. Limit lasted all the way up to the original Super Robot Wars Alpha before quietly disappearing, with absolutely nobody mourning the loss.
  • Baten Kaitos had the Turn Timer. As you class up in the game (meaning you could hold more cards in your hand) a timer was introduced where if you didn't complete your turn in time, you'd forfeit it. It starts at 30 seconds but by end game you have only seven seconds to look at your cards and decide on a move. Unsurprisingly this was replaced with a better system in the sequel.
  • Final Fantasy VIII has two rules in its card minigame, Plus and Random. Random is straightforward - your hand is randomized (instead of choosing 5 cards you want), which usually means having to play with sub-par cards. Plus, however, looks straight (if a card is adjacent to two cards, and you can add a single number to card's stats to match the stats of those two cards, both cards are flipped), but ends up being a huge pain in the neck, since it also triggers Combo (cards flipped by Plus, Same or Combo will also flip all adjacent cards with lower stats), allowing the AI to possibly flip the entire table in one move. Not to mention, unlike Same, Plus opportunities are very easy to overlook, resulting in the AI abusing the rule for all its' worth to pull off wins out of pretty much thin air.
    • This is extended into Final Fantasy XIV, which brings the Plus and Same rules over wholesale in it's recreation of said card minigame. Due to lacking any particularly good explanation or visualization of said rule, it's mostly considered the same way it is in FF8 - a way for the computer to pull off wins from nowhere.
  • Ranking up in Tetris: The Grand Master is simple enough: Score enough points. And clearing multiple lines at once gives you a better points-to-line ratio. But once you reach rank S9, the game ceases to tell you how many points are needed for the next rank. This is because the final rank of Grand Master requires you to meet score and time quotas at levels 300, 500, and 900, and finish with a high enough score and low enough time. None of which is stated in the game itself, and you're not informed whether you meet or fail any of these checkpoints. Later games in the TGM series only get more complex.
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    Game Shows 
  • Any game show that makes use of the Prisoner's Dilemma mechanic is bound to be reviled for that rule alone. The first show that had this was Shafted. At the end of the game, the two remaining players secretly decided amongst each other whether to share an accumulated pot 50/50 or shaft their opponent taking it for themselves. The contestant who picked shaft got the entire earnings if the opponent picked share. If both players picked shaft, they left the studio with nothing. Shafted got the shaft after four episodes with viewers shocked to see such a premise that encouraged lying and backstabbing. Despite this, other shows later in the 21st century adopted the Prisoner's Dilemma gimmick. Golden Balls and Take It All had this feature at the end of each show while Friend or Foe used it on every contestant who played.
  • In Final Jeopardy!, the last round in Jeopardy!, contestants use electronic pens to write down what they think is the correct response. One rule is straightforward at first glance: spelling doesn't count as long as it doesn't affect any pronunciation. Any moment where a contestant is ruled incorrect on even a slight pronunciation difference usually results in angry tweets or Facebook posts, even if it doesn't affect the outcome. The first viral case of this was on July 31, 2013, when the judges ruled against twelve-year old Thomas Hurley for misspelling the first word of "Emancipation Proclamation" as "Emanciptation". Another one happened a few months later when a defending champion was penalized for misspelling "Kazakhstan" as "Kazakhistan". On September 15, 2020, Berry Gordy was the subject to a clue and a contestant was denied credit for "Who is Barry Gordy?". That one caused debates in different American dialects pronouncing both names. A compilation of other decisions and the impact they had on some games can be seen here.
  • An incident similar to the "Berry"/"Barry" one on Jeopardy! happened on a 1982 episode of Password Plus. Marcia Wallace contested a judgment call where her contestant's guess of "Hairy" was determined to be phonetically dissimilar to the password of "Harry". The staff not only maintained their ruling against her, they also rolled out a chalkboard which explained the pronunciation difference.
  • Starting in the 1993 season of Nickelodeon GUTS, contestants started their Aggro Crag ascent at Boulder Canyon. The players climbed to the top of the first boulder and then jumped off the descending rocks until they hit the first actuator at the base of the mountain. After two seasons of contestants haphazardly navigating the obstacle, a rule change was added when the mountain became the Super Aggro Crag on Global GUTS. Contestants who did not touch every boulder, even the final one which was only a few inches high, were penalized with an automatic third place finish. This unsurprisingly led to multiple instances where a contestant who had a lead going into the Super Aggro Crag and reached the top first lost the gold medal to an opponent after getting disqualified. On one episode, two contestants got automatic thirds for disobeying the rule, and the third player won the gold despite reaching the top last.
  • Consort Longevity in Rex Factor. While Longevity is usually straightforward aside from the mathematics involved (measured from coronation till death, then plugged into the formula du jour), consorts frequently outlive their partners and, especially in the case of Queen Mothers, may be more politically active after the death of the monarch. This is handled by giving them half points for their time as Queen Mother. Of course, it's less straightforward then it sounds. What if there are multiple children, or there's a stepmother situation? Or what if she's the de facto ruler for a period of time?
  • Since practically the beginning, Wheel of Fortune has had a rule that puzzles must be solved exactly as they appear on the board. Naturally, whenever a contestant is ruled wrong for leaving a letter off a word due to their dialect (such as a contestant who dropped the G from puzzle SEVEN SWANS A-SWIMMING in 2012 and was ruled wrong for it), or if a completely filled-in puzzle is still mispronounced (e.g. REGIS PHILBIN & KELLY RIPA in January 2010), the media has a field day. Finally, the show introduced crossword puzzles in 2016; in these, three to five interlocking words are on the board, and the contestant must read off all the words in any order to solve. In doing so, the contestant may not add any other words. Multiple contestants have been ruled wrong for adding an "and" between the last two words, to varying degrees of discussion from social media and sometimes the contestants themselves.


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