%% ZeroContextExample entries are not allowed on wiki pages. All such entries have been commented out. Add context to the entries before uncommenting them.
Video games attract all kinds of people, from the casual gamer to the hardcore [[TournamentPlay tournament champion]]. But a game that provides a satisfying play experience for one may be frustratingly difficult or yawningly easy for another.

Thus, some games adjust their difficulty level behind the scenes to match the player (ignoring the fact people can just adjust difficulty levels).

When this is invoked, it's important to implement a ranking system so the better players can feel special. That way, casual players feel good about beating the game, and veterans still feel challenged trying to get the [[RankInflation SSS-level]] and beating the TrueFinalBoss.

On the other hand, some players inevitably prefer kicking ass on Easy and will get annoyed that the game won't let them, while others would rather play on Hard even if if means repeating ThatOneBoss 20 times and will feel cheated if the game "lets them win." More opportunistic players will quickly learn to intentionally play [[DoWellButNotPerfect just well enough to continue but no better]] to keep the difficulty down.

A certain measure of Dynamic Difficulty is considered good design practice in tabletop (particularly board) games, as major principles of design are "Don't make a player think they're definitely going to lose" and "Don't make a player ''wish'' they'd lose ''as long as it happens right now and this stupid game is finally over''". As it is very easy to create an UnstableEquilibrium where gathering ressources leads to being able to gather more resources later on, many games consciously employ a headwind effect that subtly slows down the leading player by having them auto-targeted by certain attacks or by awarding benefits according to reverse placement.

This is very similar to RubberBandAI. Can cause problems such as EmptyLevels. The opposite of UnstableEquilibrium, where the game gets harder if the player is doing badly. Not to be confused with SchizophrenicDifficulty, where the difficulty goes up and down unpredictably, regardless of the player's performance.

Other human players won't adjust themselves, which sometimes results in a MultiplayerDifficultySpike, though this can be lessened with matchmaking that groups players of the same skill level together.

* DifficultyByAcceleration, when the gameplay speeds up as you progress.
* LevelScaling, when enemies and/or bosses become tougher the higher your level is.
* MercyMode, when the game becomes '''easier''' in response to you failing frequently.

!!Video Game Examples:


[[folder: Action Adventure Games ]]

* ''[[VideoGame/LegoAdaptationGame Lego Star Wars II]]'', ''Indiana Jones'', and ''Batman'' feature "Adaptive Difficulty" which merely affects the amount of {{Lego}} studs you lose upon death depending on how well you play, which can go up to a very high amount.
* In ''VideoGame/CaveStory'', the Last Cave becomes a much harder level if you enter it with Booster v2.0, whose proficient use is required in the "hidden" version.


[[folder: Adventure Games ]]

* ''VisualNovel/{{Snatcher}}'' had a shooting range which could be accessed for fun. If you get consistently high scores on the shooting range, the game amps up the challenge of the plot relevant shooting set-pieces. It's advised that you do intentionally terrible on the shooting range, or finishing the game may require inhuman reflexes.
* ''Creepy Castle'' adjusts things based on how much or how little damage you take as you proceed through each area, as a way to make it feel like you "just barely" made it. If you get hit by traps a lot and/or mess up a lot of [[QuickTimeEvents duels]], then enemies' normal attacks and traps will have a chance of missing entirely, they won't crit as often (if at all), and the food you find will be items that restore more HP. If you ace most or all of the duels you fight, then enemy attacks and traps will crit you more often, and you'll find smaller food items instead.


[[folder: Beat Em Ups ]]

* In ''VideoGame/AcesWildManicBrawlingAction'', your Rank fluctuates as you deal and take damage. A higher Rank makes enemies attack more aggressively, but it also boosts the number of points you score with each hit, and how much "Wild" (energy used for [[MegatonPunch power punches]] and health-restoring "Panic" attacks) you generate per hit.
* The arcade version of ''VideoGame/FinalFight'' raises or lower its difficulty depending on how well the player performs. The difficulty is raised as play time is accumulated and is only lowered every time the player loses a life or uses a credit. On the game's DIP switches, Difficulty A (which has eight levels) affects the overall difficulty while Difficulty B (which has four) affects the rate in which the difficulty changes.
* ''VideoGame/GodHand'' will adjust the difficulty up a level (1, 2, 3, and [[HarderThanHard Die]]) if the player lands enough hits on enemies, increasing enemy strength and durability. It will then scale the difficulty back down if they take too many hits. You gain more rewards for defeating more enemies at higher difficulty levels. The game has "normal" difficulty settings, as well - the difficulty level never rises above 2 in Easy Mode, and Hard Mode has you ''always'' on Level Die.
* In ''[[VideoGame/TheSimpsons The Simpsons]]'' arcade game, the amount of enemies on screen depends on how many people are playing. In the boss fight against Smithers, if there are more than 2 players he won't throw any bombs you can throw back.
* ''VideoGame/TeenageMutantNinjaTurtlesTheArcadeGame'' features a dynamic difficulty involving the enemy count that kicks in depending on several factors, including how many people are playing in the game, and -- chiefly in one-player mode -- whether or not the player has died/continued. Beating any level without losing a life will make the subsequent level much tougher (in that you have many more enemies to contend with in each wave), and dying at all will reset the soldier count to an easier level. Also, some bosses (namely the DualBoss with Rocksteady and Bebop, and the final battle with Shredder) will have more health if you reach them without dying.


[[folder: Card Games ]]

* In a non-video game example, Canasta adjusts the number of points required for your initial meld based on your (team's) current score: 50 for a score of 0-1495, 90 for a score of 1500-2995, and 120 for a score of 3000 or more. [[MercyMode For negative scores, the requirement is 15 points, which any meld will accomplish]].


[[folder: Driving Games ]]

* This shows up in ''[[VideoGame/{{Forza}} Forza Motorsport 4]]''[='=]s World Tour. The AI starts ridiculous easy, but the more events you win, the harder they become.
* The ''VideoGame/NeedForSpeed: [[VideoGame/NeedForSpeedUnderground Underground]]'' series utilizes dynamic difficulty in two ways: first, the more you tune your car, the faster the other cars will be; second, the "Catch Up" feature causes competing cars to go faster as you pass them, and slower as they pass you. In theory, the latter makes the game more balanced; in practice, it's nothing but FakeDifficulty. With regards to the former, one of the recommended strategies if you're having difficulty is to remove all your upgrades, as the lower speed makes it much easier for you to react to obstacles and avoid mistakes. It's like playing in slow-mo.
* In ''VideoGame/NeedForSpeed: [[VideoGame/NeedForSpeedMostWanted Most Wanted]]'', the AI's cars [[Main/RubberBandAI get faster the more races you win, and become slower when you lose one]]. Thus the easiest way to win races is to deliberately lose about every fifth race to keep the competitors' car speeds as low as one wants.
* In ''VideoGame/MidnightClub'', the type of vehicle you bring to a race determines what kind of opponents you'll face: bring a VW Golf and the other racers will be driving low-level tuners; bring a Lamborghini or Ducati and they'll have high-end exotics.
* ''VideoGame/GranTurismo 4'' uses "[[BraggingRightsReward A-Spec Points]]" to encourage you to choose slower, less powerful cars to win the race: the more powerful your car is, the smaller your score will be. If, for example, you manage to win against a squad of sleek German machines with a puny little Pontiac Sunfire, you'll win 200 points; but if you win the race with the superpowered Polyphony Formula Gran Turismo, you'll win 1 single point. However, A-Spec points aren't a reliable method of judging difficulty, as the game seems to mainly base the point levels on your car's specs relative to the AI, and it's possible to get easy 200 point races in vehicles such as the Suzuki GSX-R/4, which much less powerful than most supercars but is good handling and very light.
* Apart from the notorious RubberbandAI, ''VideoGame/MarioKart'' implements certain headwind effects by designing power-ups to be more useful when you're in the back - shells are more powerful than banana peels, but shells only work against opponents in front of you while peels are only useful against those in the back.
** That said, later games in the series tried to balance themselves a bit better than the original ''SNES'' title. This includes small changes such as being able to shoot the aforementioned shells backwards or catapulting banana peels forward, among other things.

[[folder: Edutainment games ]]

* Many edutainment games start you off on the lowest difficulty setting by default. Then, depending on how well you're doing, it will start to throw harder challenges at you. If you have trouble on a certain difficulty level, it keeps you on that level.
* In ''[[VideoGame/JumpStart Jump Start Typing]]'', you have to type to a certain level of words-per-minute to unlock Coach Qwerty from the trophy closet, and the activities are merely to practice typing. The difficulty of the game, however, is proportional to how well you do in the initial trial, and it is therefore possible to finish the game in a ''ridiculous'' amount of time by simply typing at 1 word per minute so the goals are set low, and then proceed to steamroll through it all.

[[folder: Fighting Games ]]

* ''VideoGame/MortalKombatVsDCUniverse'' features this type of AI. Lose, and it will edge down the difficulty slightly. Lose more, and it keeps sliding the difficulty down until you can win and continue progressing through the story. The final boss is not exempt from this difficulty edging, either.
* Most of Creator/{{Capcom}}'s fighting games will make it so that the opponent gives more and takes less damage the more you win. This occurs on any difficulty setting.
* ''VideoGame/SmackdownVsRaw'': After a few wins the computer will kick into overdrive and engage TheComputerIsACheatingBastard mode to make you lose, no matter how much it has to break the game to do so.


[[folder: First-Person Shooter ]]

* ''[[VideoGame/{{SiN}} SiN Episodes: Emergence]]'' features the Personal Challenge System, designed to adapt itself to the player's skill level and varies the skill, numbers and toughness of enemies faced in accordance the player's performance. It was claimed that thanks to this, a proficient FPS player and a brand new FPS player would be able to finish the game in roughly the same amount of time. However, a bug present on release in the system caused the game to never ease up on players making it overly challenging and unforgiving. This has since been corrected. [[note]]The game's balancing system worked off of invisible triggers you ran past, among other things. Going over one recorded the time since you'd gone over the last one and deactivated it. Going faster obviously made the game harder. What went wrong is that one of the levels had left in it an extra trigger used for testing, which made the game think you were going faster than you really were in one part... And it didn't deactivate, and was in the middle of an area with a fight so there's a good chance you'd end up going back and forth over it several times, causing the game to think you'd run through half a dozen checkpoints in 20 seconds, thus cranking the difficulty into the stratosphere and making the difficulty-lowering functions a drop in the bucket. These invisible triggers are also autosave points, and loading from an autosave would lower the difficulty, while loading from a quicksave would not. This still applies (though not nearly as much) in the bugfixed release, though in the original version the way most people played (quicksaving and quickloading) meant that the game never let up, as opposed to dropping difficulty slightly each load from an autosave point.[[/note]]
%%* ''VideoGame/UnrealTournament'' has the option to turn adaptive bot AI on and off, and it gets quite eerie sometimes...
* ''VideoGame/Left4Dead'' features a "director AI" that spawns Infected based on how easily the players made it past the previous encounter. If the skirmish ends with the players healthy and having used few ammunition, the director sends in a horde. If the players are dying and low on ammo, the director only sends in a few. If you are playing on Expert and are doing poorly, it says "why aren't you dead yet?" and redoubles its efforts. Whimper.
* ''VideoGame/KillingFloor'', in addition to the regular difficulty levels, increases the number of specimens per wave and gives them more health depending on the number of players.
* Many checkpoint-based shooters give you a number of checkpoints/savepoints inversely proportional to your skill level and how far you progress in a level without dying.


[[folder: Four X ]]

* The ExpansionPack to ''VideoGame/GalacticCivilizationsII'' can be set to feature massive events that intentionally destabilize the playing field from time to time to keep things interesting. Additionally, the player can also tweak the personality, competence, and [[KarmaMeter starting alignment]] of the factions.


[[folder: Hack and Slash]]
* The ''VideoGame/{{Diablo}}'' series adjusts monster difficulty based on player level and number of players.

[[folder: Light Gun Games ]]

* The arcade ''VideoGame/LethalEnforcers'' started with a certain amount of time a baddie took to hit you (a bit under three seconds). This gradually decreased over time and reset only after you took a hit. The upshot was that you'd have to shovel in a ton of tokens to get to the end of the game ''no matter how good you were''. Lethal Enforcers 2 was even more brutal, with a shorter starting time and a ''much'' faster decrease.
** The ''VideoGame/{{Police 911}}'' spinoff [[SequelDifficultySpike take this]] UpToEleven: It's extremely fast, with [[CatAndMouseBoss bosses running and shooting around]]. Players have to aim more precisely in order to defeat the boss.
* Many {{Light Gun Game}}s amp up the difficulty if there are two players present. Which means if some little kid decides to jump in on your game despite your protests, the game becomes ''much'' harder because the presence of an annoying kid who doesn't know how to play has made enemies more numerous and difficult to destroy.
** For a specific example: ''The VideoGame/HouseOfTheDead III''. With 2 players playing, zombies double in number, and bosses take twice as much shots to cancel their {{Break Meter}}s. This is especially bad with The Fool's [[ThatOneAttack swiping attack]], which requires 6 shots in less than 2 seconds to cancel, and that's only in 1-player mode. In 2-player mode, you need 12 shots (6 per player), so unless the other person is competent at the game, he or she will be bogging you down and [[FakeDifficulty making you lose a life EVERY TIME, NO MATTER WHAT]]. Also, for the whole series: Playing good or poorly in a stage will change the boss' speed.
** ''Brave Firefighters'', though not exactly a "true" gun game (you use simulated firehoses instead of guns), operates on a similar principle. If you play in 2-player mode, the time bonuses for clearing segments quickly are lower.


[[folder: [=MMORPGs=] ]]
* ''Videogame/EveOnline'' features wormholes, where the amount of enemies depends on the number and size of the player ships. Don't ever try to bring a carrier (a capital ship) into the fight, however. Each time you do, there is an extra spawn of a few sleeper battleships. Unless you are doing this specifically to farm them, this is tantamount to suicide.
* A staple of open-world content in ''Videogame/GuildWars2''. Dynamic events adjust the number of enemies, variety of abilities available to bosses, and HP of destructible objects according to the number of active players present.
* ''VideoGame/FinalFantasyXIV'' has many FATE events spawn more and more enemies the more players participate in them, making it easier for everyone to contribute enough, but not overwhelming smaller groups of players. FATES and dungeons also have sort of a reverse version of this in the form of Level-Synch, which temporarily lowers the players level to the intended level range.


[[folder: Multiple ]]

* Most games developed by Platine Dispositif feature a "Phase" system, where higher phase levels increase the number and speed of bullets the enemies shoot at you. Getting hit or using bombs decreases your phase level, while defeating mini-bosses (or bosses) increases it. Demonic Mode, which is HarderThanHard, starts you off at the highest phase level, and it never decreases.


[[folder: Platform Games ]]
* Games in the ''Franchise/CrashBandicoot'' series will often disable environmental hazards and/or move checkpoints if a player dies too often on one particular obstacle.
** The spin-off party game ''VideoGame/CrashBash'' does this for practically every game with computer-controlled opponents. If you win too easily on the first match, the computer suddenly gets harder for the second, and vice versa if you lose by a lot of points. Case in point: the final boss (a PONG clone) is nearly untouchable the first time you fight him, but every time you lose, he gets easier and easier until he can't even return the very first ball. However, the instant you DO score against him, his difficulty goes back up. Winning this fight means using his Dynamic Difficulty to make sure he's easy enough at the first ball that you can still win when he hardens after being scored against.
* ''Franchise/RatchetAndClank'' has a leveling system, and experience points are kept when you die. If you die a lot, you will end up getting stronger than if you played through the game without dying or revisiting old areas. In addition, dying against a single obstacle too many times will either disable it or have the checkpoint moved.
* The ''Videogame/MegaManZero'' series assigns you a rank after every mission based on how well you completed it. If you fought a boss while having an '''A''' or '''S''' rank, the boss used new, stronger attacks [[VictorGainsLosersPowers which Zero would gain for himself]] after winning the battle.
* The ''Videogame/SpyroTheDragon'' series scales difficulty depending on the skill of the player. Unfortunately, this results in an individual playing on the lowest difficulty setting being incapable of completing the third game 100%.
* Perhaps the earliest advertised use of this is in ''VideoGame/{{Gods}}'', which would at predetermined points give the player a "help bonus" if he was doing poorly, or spawn additional enemies if he was unhurt.
* ''VideoGame/RabiRibi'' has two types of boss scaling available. The original type has bosses increase in level the more equipment and stat-raising items you collect, while the alternative type has bosses increase in level based on current story chapter instead.

[[folder: Puzzle Games ]]

* In Master Mode of ''Videogame/TetrisTheGrandMaster 2'' and ''3'', certain game mechanics behave this way:
** ''[=TGM2=]'' requires the player to clear each section in under 65 seconds to get a Master or Grandmaster grade (the latter being the ultimate goal of the game), and failure to do so in any section [[{{Unwinnable}} caps the player's grade at S9 for the session]]. However, clearing sections in 63 seconds or less can raise the bar for subsequent sections for that session. The time limit for section 6 is 65 seconds or the average time for the first 5 sections plus 2 seconds, whichever is lower, and the time limit for each subsequent section is 65 seconds or the previous section time plus 2 seconds, whichever is lower.
** In ''[=TGM3=]'', if you complete a section fast enough, you will get a "COOL!" message, which gives a bonus to your grade. Each time you do this, it also causes the speed level to increase by 100. Meaning, if you get a COOL!, then advance to level 200, the game will act as if you're at level 300. Do this for the first two sections and you'll hit maximum drop speed at only three-tenths into the game (as opposed to halfway through if you don't get any COOL!s). In addition, the time limits to get a COOL! are also set as "X seconds or 2 seconds more than the previous section's time", with lower values of X for later sections.


[[folder: Real Time Strategy ]]

* The ''VideoGame/{{Homeworld}}'' series scales enemy fleets to match yours, to a certain extent. In the first game, it's easy to have an overwhelmingly powerful fleet anyway by abusing the {{Cap}} system by capturing enemy ships. In ''Homeworld 2'', capturing ships is no longer practical and enemy fleets scale so heavily in comparison to yours that building more ships makes the game harder, not easier. Amusingly, a well-known exploit is to retire your fleet at the end of a mission -- the next one will be staggeringly easy as you can rebuild your fleet in a few scant minutes.


[[folder: Roguelike Games ]]

* ''VideoGame/TheBindingOfIsaac'':
** The game does a variation on this. While playing through the game more and more times unlocks more items to use, it also inevitably unlocks more bosses to have to fight (including stronger versions of previous bosses) and more levels to have to clear, making the game harder and longer the more you play it and beat it. One achievement even blatantly makes the game harder (increasing the likelihood of [[EliteMook champion enemies]] and curses,) and beating [[spoiler: Isaac in the Cathedral]] for the first time increases the likelihood of a curse even further.
** The two new bosses added in the ''Afterbirth'' DLC to ''Rebirth'' are designed to counter players who increase their damage so high that even bosses fall in seconds to the onslaught. That is to say, each of them gauges a player's attack power and scales their health to match it. At least one of them even has a hard cap on how much damage the player can do to it. This ensures that no matter how powerful you made yourself in a given run, these bosses will take you some time to defeat.


[[folder: Role-Playing Games ]]

%% The Battle Tower in ''Franchise/{{Pokemon}}'' DOES NOT become harder the better you are, nor does any currently extant version from a later game (Subway, Maison). This is an UrbanLegendOfZelda. Do not add this example back.
* ''[[VideoGame/PokemonRedAndBlue Pokémon Yellow]]'' is a subtle example. You start with a Pikachu (Electric-type), and your rival starts with an Eevee. What he evolves it into depends on whether you win the first two battles with him:
** If you win both battles, he evolves it into Jolteon, which is resistant to Electricity.
** If you win one battle and lose or forfeit the other, he evolves it into Flareon, which takes normal damage from Electricity.
** If you lose or forfeit both battles, he evolves it into Vaporeon, which is weak to Electricity.
* The difficulty of a level in ''Videogame/NetHack'' is based on the average of your character level and the dungeon level.
* ''VideoGame/FinalFantasyVIII'': Monster levels depend on the average level of your party, and their attack patterns will differ depending upon their level. As a result, grinding early on without paying any attention to your junctions can and will screw you over utterly.
** Unfortunately some of the bosses (especially the optional ones) would become disproportionately harder as the player gained levels. Some would gain tens of thousands of extra HP for every player level whilst the player's ability to do damage increased by nowhere near that much. This made a lot of the game much easier if the player went for a LowLevelRun. It also effectively meant EmptyLevels.
* ''VideoGame/FinalFantasyThe4HeroesOfLight'': Once you open up the VeryDefinitelyFinalDungeon, monsters and bosses will keep pace with the party's levels.
* ''VideoGame/{{Fallout 3}}'' assigns experience points based on the difficulty setting. Conversely, the higher your level, the tougher your enemies will be when entering new areas. ''VideoGame/FalloutNewVegas'' also has {{level scaling}} for certain enemies, especially in the DLC's.
* ''VideoGame/SagaFrontier'': Improving your party's effectiveness via StatGrinding increases the difficulty of enemy encounters.
* In ''VideoGame/IterVehemensAdNecem'', monsters get more difficult as you become more powerful (and boss monsters will appear at particular thresholds), but your companions are not included in this calculation. One easy(-ish) way to win is to collect powerful allies and pets, and have them do all the work for you.
* ''VideoGame/EiyuuSenkiTheWorldConquest'' rewards the player for conquering regions outside of the game's recommended order with unique and useful accessories while also raising the strength of the remaining regions as a result.


[[folder: Rhythm Games ]]

* ''VideoGame/GuitarHero 5'' has a battle mode called "Momentum", which increases the difficulty every 20 combo (starting at medium), and drops you back down after 3 misses in a row. ''Warriors of Rock'' adds "Momentum+", where it increases every 10 combo instead, and automatically drops the leading player back down to ''beginner'' difficulty if Star Power is deployed.
* [[Videogame/{{DJMAX}} ''DJMAX Portable'']] increases the current scroll speed as the player's Fever (score multiplier) goes higher.
* Featured in ''VideoGame/{{Rocksmith}}''.
* ''VideoGame/{{beatmania}} IIDX'' has Step Up mode. First, your current [[KyuAndDanRanks dan rank]] dicatates the initial pool of charts you get to play; the higher your rank, the harder the songs you'll start with. Second, as you clear songs, the the game gives you harder charts to play, while failing songs will decrease the difficulty of charts allowed. To accomodate this feature, Step Up guarantees three stages, even if you fail your first two.


[[folder: Shoot Em Ups ]]

* ''VideoGame/XenoFighters'' has this as of v0.10 in the form of a rank system similar to that of ''VideoGame/BattleGaregga''.
* ''VideoGame/{{Raiden}}'', ''VideoGame/RaidenFighters'' and ''VideoGame/FireShark'' are notorious for this, frustrating would-be 1cc players in the form of the tank/gunboat enemies. If you do well enough (survive long enough, amass loads of points, get lots of powerups/bombs), the tanks/gunboats that initially have poor reaction time as well as {{Painfully Slow Projectile}}s start shooting you with faster and more accurate shots ''as soon as they come onscreen''. If you're doing well enough, you'll start meeting up with [[FanNickname so-called]] "[[ImprobableAimingSkills Sniper]] [[DemonicSpiders Tanks]]".
* ''VideoGame/BattleGaregga'' exponentially increases in difficulty by increasing enemy aggressiveness and health due to a number of factors, such as picking up too many items you don't need and shooting too much. The only way to reverse this? Dying. (Especially effective if it's the player's next to last life.) To make matters worse, every time someone plays the game, the starting rank (difficulty) goes up, and each time the attract mode loops the starting rank decreases. The idea is the more people are playing it the harder it gets, so it can eat more quarters, but if people stop it backs down so a new player will have an easier time and get hooked. However, people figured out that resetting the arcade game also reset the rank. So Raizing fixed this in their next game, ''Videogame/ArmedPoliceBatrider''. The rank at power-on was the ''maximum'' possible starting rank instead! This is a (very infamous) trade mark of Shinobu Yagawa, the programmer of ''Battle Garegga'', ''Videogame/BattleBakraid'', and ''Batrider''. These traits are in his later games with ''Videogame/{{Cave}}'', ''Videogame/{{Ibara}}'', ''Videogame/PinkSweets'', and ''Videogame/MuchiMuchiPork''.
* In modern {{Shmups}}, this is known to fans as "rank" and very common. This has been a feature in shooters since the Japanese release of ''VideoGame/{{Zanac}}'' in 1986. That game had artificial intelligence that adjusted itself to your playing style. However, the AI wasn't all that bright, and could be subverted by simply firing less. ''Zanac'' for the NES got this [[UnstableEquilibrium ass-backwards]]. The AI level ''decreased'' if the player could defeat a boss [[StalkedByTheBell within the given time limit]] but ''increased'' if the player could not defeat a boss within the time limit.
* ''Videogame/TriggerheartExelica'' calls this the VBAS (Variable Boss Attack System): basically, this means that the more point medals you collect during the level, the more forms the boss of that stage has and the harder it is. If you have enough, you even have to face a BonusBoss afterwards.
* In ''VideoGame/{{Darius}} Gaiden'', getting a shot powerup will increase the difficulty to the stage's default difficulty.
* ''VideoGame/{{Touhou}}'' has this is the 4th to 6th games. It gets remarkably less complicated each game. In the 4th game (''Lotus Land Story'') pretty everything that could be considered playing well raises it, but the opposite is also true, meaning that letting point items fall off the screen makes the game easier. The next game (''Mystic Square'') has fewer things increase the rank, but the only ways to decrease it are dying and bombing. ''Embodiment of Scarlet Devil'' has the rank just keep going up over time and can only normally be decreased by dying. And for some reason it resets to the middle level with each stage. None of the other games use rank, though ''Imperishable Night'' lets you start with more lives if you keep continuing.
%%* The ''Videogame/{{Gradius}}'' series has both this and its infamous UnstableEquilibrium, the worst of both worlds.
* ''VideoGame/DonPachi'':
** In ''[=DoDonPachi=] dai ou jou'', using a [[SuperMode Hyper]] will cause enemies to fire more and faster bullets.
** In ''[=DoDonPachi=] Dai-Fukkatsu [[ExpansionPack Black Label]]'', you get a new SuperMode known as "red mode" in which continuously using it will gradually crank up the difficulty, indicated by a special gauge off to the side of the regular HUD. Red mode is required for certain score bonuses to activate.
** ''[=SaiDaiOuJou=]'' has a visible numeric rank meter. Getting it high enough is one of the requirements to fight [[TrueFinalBoss Hibachi]].
* ''VideoGame/TumikiFighters'' makes the game harder if you try holding on to a large number of enemy ships (thus maximizing your score). If you lose these ships, the bullets immediately thins out.
* ''VideoGame/WarningForever'' adjusts to the player's tactics. If a player focuses on destroying a particular segment of a boss, the next boss will have that section reinforced. If the boss manages to kill the player, [[UnstableEquilibrium it'll have more and better guns of the same type next time]].
* The faster you destroy groups of enemies and {{mini boss}}es in ''VideoGame/{{Ikaruga}}'', the more enemies are generated. The screen is also cleared of bullets when you die, and dying also decreases the difficulty of certain bosses, especially Tageri. The third boss's difficulty is unfortunately [[UnstableEquilibrium bass-ackwards]], as it spins faster the longer the fight takes (although it times out after a while).
* The ''VideoGame/RaySeries'' also does this. Especially the third game, where the enemies become more abundant and tougher the lower your Encroachment percentage.
* In ''VideoGame/ChaosField'', if you switch from the Order field to the eponymous Chaos field, your weapons become more powerful, but the bullets [[BulletHell greatly increase in speed and density]].
* The difficulty of the bosses in ''VideoGame/{{Rez}}'' increases depending on the player's skill in shooting down enemies.
* ''VideoGame/{{Daioh}}'': The difficulty of the game increases depending on how well you do. The farther you go without dying, the more likely it is for the game to become a BulletHell.
* ''VideoGame/GigaWing'': The game's overall difficulty gradually increases until your first death; some players will exploit this by committing suicide at the very start of the game.
* A common variant is to spawn extra enemies (primarily {{Mooks}}) if the player finishes off a MidBoss quickly, which also doubles as a reward (more mooks means more points, more item drops, and/or a longer KillStreak) as well as a way of filling the time while waiting for the background scrolling and/or MickeyMousing music to resync with the level again. The ''VideoGame/{{Touhou}}'' series does this a lot, as well as ''[[VideoGame/DonPachi DoDonPachi Daifukkatsu]]'' and ''VideoGame/{{Ikaruga}}''.
* A more subtle example in ''VideoGame/HeavyWeapon''. The better you do, the higher your score, and thus the higher your rank. The higher your rank, the more often your airborne foes will drop bombs on your tank.
* ''VideoGame/{{Gradius}}'' games tend to increase in difficulty the more firepower you have. This is most notable in the original game, where at minimal firepower and no Options the [[RecurringBoss Big Core]] will fire [[PainfullySlowProjectile slow and easily dodgable lasers]], but at maximum firepower the lasers practically break the sound barrier.
* ''VideoGame/BlueRevolver'' has five levels of rank, with the difficulty level chosen at the start of the game determining the range of levels that the game will go through. Normal keeps the rank clamped to levels 1 and 2 (the lowest two), Hyper allows the game to use all five levels, and [[HarderThanHard Parallel]] locks the rank at level 5 for the duration of the entire game.

[[folder: Simulation Games ]]

* ''[[VideoGame/AfterBurner After Burner Climax]]'' adjusts its difficulty depending on how many enemies you shoot down in a level. If you get more than 50%, you'll earn a star (up to five). Dying brings the star level down by one, and using a continue resets it to zero. More stars = more enemies bombarding you with missiles. However, if you have a full set of five stars when you reach specific stages, you'll access an "S" version of that stage instead of the main one.


[[folder: Stealth Games ]]
* ''VideoGame/YandereSimulator'' refers to its dynamic difficulty as "school atmosphere". When students discover dismembered body parts, puddles of blood, corpses, and unexplained suicides, the school's atmosphere begins to drop. As it drops, students become more paranoid: their line-of-sight increases, they become harder to sneak up on, they react faster to finding unusual and grotesque things, and they become more scared when they catch Yandere-chan acting dangerous. A week of peace will help restore the atmosphere back to normal.


[[folder: Sports Games ]]

* The AI opponents in ''VideoGame/WiiSports'' combine Dynamic Difficulty with RubberbandAI. Get enough home runs in baseball, and they start to make it harder to do in subsequent games, for instance.


[[folder: Third-Person Shooter ]]

* ''Franchise/ResidentEvil'':
** In ''VideoGame/ResidentEvil4'', playing well will increase the amount of spawned enemies and improve their AI; conversely, playing poorly and dying often reduces the number of foes and disables most of their AI. Ammo and health item rarity is also affected by dying.
** ''VideoGame/ResidentEvil5'' has a similar dynamic difficulty mechanic to ''Resident Evil 4'', which has been discovered to use a hidden points system. Basically, the game has 11 separate "sub-levels" for the difficulty level, changing how much damage enemies deal, and how much damage they take from your weapons. Attacking and killing enemies adds points in small amounts (anywhere from 2 points for each hit you deal, to 100 points for a critical headshot), while taking damage or dying subtracts points in larger amounts (from 400 points for a small hit, to 1200 points for dying and continuing). For every 1000 points added or subtracted, the game shifts the difficulty up or down one level. Each of the four difficulty modes (Amateur, Normal, Veteran and Professional) has a minimum and maximum setting, and although some of them overlap, Professional mode is in a league of its own. At the lowest setting, enemies deal half as much damage to you, and take 2.5 times normal damage from your weapons. For the sake of comparison, Veteran mode's highest setting is the second-highest overall, where enemies deal three times normal damage to you, and take 88% normal damage from your weapons. The highest setting, which Professional mode stays at all the time, makes enemies deal ''ten'' times normal damage to you. The official guide had an entire section devoted to this system, and how to game it.
* ''VideoGame/MaxPayne'' claimed to do this. Bear in mind, it had this ''in addition'' to three difficulty modes.
** The trope is more obvious in ''Max Payne 3'', where the player receive extra painkillers if they die several times in at the same checkpoint.
* ''VideoGame/KidIcarusUprising'' lowers the difficulty every time you die, unless it's already at 2.0 or lower. The hearts invested in the difficulty increase are lost however, and weapons found in the level correspond in power to the difficulty you end on. It doesn't scale up during a level if you do well, but the recommended difficulty for the next level corresponds to how well you did last level.


[[folder: Turn-Based Strategy ]]

* ''VideoGame/{{XCOM}}'' lets you select a difficulty level to begin the game at, and then moves it up or down a notch once per in-game month depending on your score that month. This is rather undermined by an [[GameBreaker unfortunate bug]], which resets the difficulty to the lowest level when you loaded a saved game. Saving and restoring frequently could make the game arbitrarily easy! Even then, the monthly timer has very little effect even without saving and loading; since the game is made up of two executables, it has to save and quit each time you switch from a land battle to the world map (or vice versa). In short, it's impossible to play more than one battle before the difficulty resets to the lowest level unless you patch the game to fix this (using, say, [=XcomUtil=]), or use the Windows-based re-release.
* The ''VideoGame/SuperRobotWars'' series has Battle Masteries, which are optional, and occasionally difficult, goals to reach in a mission. Depending on how many Battle Masteries (also known as Skill Points) you have at certain points in the game, the difficulty will scale back to Easy, or up to Hard mode.
* Sting Entertainment's two flagship GBA games, ''VideoGame/RivieraThePromisedLand'' and ''[[VideoGame/YggdraUnion Yggdra Union: We Shall Never Fight Alone]]'', reduce enemy HitPoints and other stats (notably, the [[LimitBreak Rage bar]] in ''Riviera'') when the player loses. In ''Riviera'', if you lose enough, you won't have to fight the enemies at all (although this doesn't work on bosses, for obvious reasons). ''Yggdra Union'' just scales down until a certain minimum point, and then stops (although practically, the player is getting stronger all the time because of how the game handles experience).
* Early in the ''VideoGame/WingCommander'' series, there was supposed to be an adjustment of AI skills, in the games before DifficultyLevels. However, for many there's often little to no notice of much of a difference, in any of the games where this trope was in effect.
* CPU-controlled [[MechaMook Jugger]] from ''[[VideoGame/AdvanceWars Advance Wars: Dual Strike]]'' has this as part of his C.O. Power "Overclock", along with an increase to his [[LuckBasedMission positive and negative extremes of his luck modifiers]]. He has two separate AI scripts in the game, [[ArtificialStupidity a quite stupid one that he uses normally]], and a [[ArtificialBrilliance much smarter one]] that he follows when his power is active. Of course when you're playing as Jugger, all you get is the luck modifiers. [[CaptainObvious Your DS can't make you stupid when you're not using your CO's powers, after all]].

!!Non-Video Game Examples:

[[folder:Live-Action TV]]
* On the Japanese game show ''Series/{{DERO}}!'', the Bomb Room round worked this way. All questions were multiple-choice, and each time the team gets a question wrong, the number of choices on all subsequent questions was also reduced by one. If you did poorly enough, you'd end up facing 50/50 choices, albeit for relatively paltry potential rewards. Some of the other rounds seemed to do this as well, albeit in a less obvious manner. For example, in the Block Word Quiz section of the Beam Room round, a team that was doing especially poorly would often get puzzles with answers only 2 characters long instead of 3.
* Many game shows have methods to adjust the difficulty of the game to match the budget, especially in the BonusRound:
** When the producers want to make ''Series/WheelOfFortune'' harder, they use shorter puzzles in the main game, and the bonus round will usually be a short puzzle and/or one with many different vowels and/or uncommon consonants, e.g. "OAK BUREAU" or "ZOO".
** In the daytime version of ''Series/WhoWantsToBeAMillionaire'', the writers are fond of asking about arcane details of the lives of celebrities and historical figures, often from before they became famous, e.g. asking what Jon Stewart's part-time job was in college, or what George Washington named his dogs. These questions reliably stop contestants dead in their tracks, and they appear to be placed higher or lower on the money ladder based on how much under/over-budget the show is.
** The Fast Money round of ''Series/FamilyFeud'' will have questions with one or two very popular answers that easily come to mind when they want to give away the money, e.g. "Name a yellow fruit" (banana, lemon, maybe pineapple) or "An animal with three letters in its name" (dog, cat). When they've gone over budget, they switch to questions with a wide spread of answers, often numerical, e.g. "On a scale of 1 to 10, how X are you?" or "At what time do you usually eat lunch?"
** ''Series/ThePriceIsRight'' has easy games and hard games. If they've gone over budget in previous shows, they'll bring out That's Too Much or Range Game, which contestants have historically been bad at. Individual pricing games can also be adjusted, e.g. in a "put the digits in the correct order" game (Ten Chances, Safe Crackers, etc.) a 0 makes the game easier since it's usually the last digit, and it obviously can't be the first.
** ''Series/PressYourLuck'' would switch to easier-than-usual questions if not enough spins were being earned. For the audience at home, there was a tell for when this happened; the light bulb on the host's podium would blink to prompt him.

* Most pinball tables have a setting to dynamically adjust the replay score (which awards a free game when a player reaches it) based on how well players have scored in previous games. That said, this is only really in effect in a business that uses pinball games to make revenue, as there's no mid-credit advantage for hitting the replay threshold.
* Most games offer some sort of "mystery award" feature, which gives a random award - usually points, feature completions, or even lighting extra balls. If you're having a poor game, it's much more likely to award a lit extra ball -- on the other hand, don't expect more than a small point reward if you're doing well.
* Creator/{{Gottlieb}}'s ''Pinball/{{Caveman}}'' was a {{Pinball}} table with a built-in VideoGame. The difficulty of the video game would change based on how well the player did on the pinball board.
* In ''Pinball/StarWarsDataEast'', shooting the ramp several times lights the Extra Ball shot. The number of shots needed would adjust over time based on how well players did.
* In ''Pinball/SafeCracker'', the difficulty of the bank vault board game changes according to how well you were on the pinball playfield.

[[folder: Real Life]]
* It is not uncommon for automated tests to use a binary branching system to determine what the next question will be on a test:
** Registered Nurse (RN) and Emergency Medical Technician (EMT) certification exams both involve branching difficulties. Because of this, if you correctly answer enough questions at the beginning of the exam, they will pass you without requiring you to finish.
** The computerized Graduate Record Examination (GRE) branches, though you ''do'' need to finish answering all the questions; it just impacts your final score.
%%** Many computerized standardized tests do this.
%%** In recent years, so do driver's ed tests.