A type of AI opponent, faced in the single player mode of a competition focused video game, who breaks the rules that enforce Competitive Balance to such an absurd degree that they are considered to be vastly superior to every other character in the game.
In a nutshell, the SNK Boss combines That One Boss with The Computer Is a Cheating Bastard. Powers may include:
- Complete Disregard for System Limitations: While you may have to switch between high and low blocking, the SNK Boss needs to only block one way. Where you have to crouch or be in a specific position to perform certain moves, the boss does not. When certain attacks require charge motions, the boss can throw them out rapid-fire. Where you have a regular super meter, the boss either fills its super meter much faster than yours, has a regenerating super meter, or, in extreme cases, has no visible one, meaning it can use as many supers as it wants whenever it wants.
- Blatantly Overpowered Offense: A trademark of the SNK Boss. Where you have fireballs, the boss has full-screen lasers that come out faster than you can blink, deal damage equivalent to 1/4 of a health bar (and also deal about a third of that in chip damage if you block it), and snuff out all other projectiles. If you have an invincible uppercut, the boss likely has one where he surrounds himself with lightning for more hits and damage and can cancel out fireballs. They also likely have lots of unblockable attacks, in addition to doing lots of chip damage, having confusing or difficult-to-block attacks, frame advantages no matter what you block, and dealing tons of guard damage (and possibly having at least one instant guard break). If you get past the first round, the second round is vastly worse - they may enter permanent rage mode, automatically start with full super and/or EX meters, gain brutal new attacks, or otherwise go from rough, but doable to absolutely ridiculous. These types of bosses sometimes, but not always, have a maximum level super where they show off their superiority by utterly annihilating you regardless of your current health, usually combined with Finger Poke of Doom for maximum insult.
- Blatantly Overpowered Defense: They may be the gameplay equivalent of The Juggernaut, being able to continue their attack startup against your own hits or possess features like a larger health bar, reduced block-stun, inability to get dizzied (or a shorter dizzy period), inability to guardbroken (or have a guardbreak meter that fills up so slowly that they may as well be), immunity to chip damage, extremely fast grey health regeneration, or they can interrupt your combos with their attacks (oftentimes via super armor), escape from a juggle via some sort of recovery/teleport, or even be completely immune to some of your attacks (such as grabs).
- Perfect Play A.I.: The most infuriating aspect of any such boss character. AI that blatantly reads the player's inputs and responds with its fastest, safest counterattack option, usually done at lightning speed with tool assists and frame-perfect precision timing. The AI also moves and reacts much faster than what should be possible if the same character was being controlled by the player, making it frustratingly difficult to reliably attack, or even punish the AI in the rare event that it whiffs an attack.
If the boss is playable, such as upon defeat or paid and hired, they are significantly weaker and more balanced for actual play. A non-weakened playable SNK Boss is most certainly banned in any competitive tournaments where it would be a Game-Breaker for one human player to use on another.
In some fighting games, the Final Boss is a unique opponent in both design and ability (such as a 30-foot Eldritch Abomination) that is Purposely Overpowered and only appears in single-player/non-competitive game modes; it's slightly more sensible that such a boss would have those high-powered attacks rather than a human-sized villain. It can also feel pretty good for a player who manages to use an otherwise-mortal badass to beat the crap out of a godlike monster.
These bosses originate from the days of arcade machines, where the high difficulty level was used to separate players from their pocket change while attempting to register their initials in the top spot of the machine's High Scores table. In console games, side effects of continued exposure to an SNK Boss may include broken controllers and increased sales of GameSharks to "cheat back". Occasionally, these bosses may have an Achilles' Heel that utilizes special moves from characters that usually have limited utility. It is unknown whether these are intentional or not.
In games where SNK Bosses are unlockable via real money such as Downloadable Contents and Gacha Games, the players are willing to spend extravagant amounts of money to get them. Such practices led to the new variation of this trope, $NK Boss.note
Is there an upside to this? Gameplay and Story Integration. Given that characters of this kind are frequently talked up in the story as being terrifying and powerful, if they fall into this category then at least the player doesn't feel like all the hype and drama was over nothing.
Takes its name from the company SNK, which seems to love making bosses like this and having each successive one top the last. This is also a case of Follow the Leader, especially with Arc System Works.
Note, SNK Boss is not a catch-all term for an overly hard, cheap, or even mechanically unusual boss. It's the way the boss breaks the competitive balance of a largely competitive game that makes it an SNK Boss. By definition, bosses of largely single-player experiences — RPGs, Platformers, Stylish Action, etc. — are not SNK Bosses due to those games being non-balanced by their very nature. In many situations, such bosses likely fall under the category of Superboss instead. However, if the game has a Competitive Multiplayer mode where two players are given equal opportunities to win, and the Final Boss (or a Mid-Boss) is intentionally made in such a way it completely breaks balancenote , it qualifies. A competitive Racing Game, for example, may have a champion with an absurdly tricked-out car which, combined with a deep knowledge of the track the battle takes place in, gives it an unfair advantage, no matter which vehicle/racer you choose; and an Arena Shooter may buff up the boss so it spawns with all the weapons, all the powerups, full armor and health every time they're fragged, and on top of that it has peak AI.
Subtrope of Fake Difficulty and My Rules Are Not Your Rules, the latter also a subtrope of The Computer Is a Cheating Bastard. See also Perfect Play A.I., whose difficulty arises less from outright cheating, and more from a flawless battle strategy, and Superboss, an incredibly difficult, hidden optional boss that may or may not be an SNK Boss. Do not confuse with That One Boss, which describes a difficult boss as declared by a majority and technically fights on a much fairer level when compared to this trope. See also Easy Levels, Hard Bosses. Don't be surprised if they can only be toppled via Not the Intended Use, chiefly AI Breakers.
As the boss cheating the game is often a Plot Twist, all spoilers are unmarked.
Examples:
Fighting Games
- Nitros Oxide in Crash Team Racing is deliberately designed to be as unfair of a boss as possible. It's one thing that he drops the items of every single boss character, but he also crosses the starting line before the green light, and datamining reveals that he's the only character in the game (besides Penta Penguin in the European release) who has perfect stats in every category.
- In a game that's basically an Arena Shooter that usually pits players/bots against each other in equal conditions, the Playstation 2 version of Quake III Arena, called Quake III: Revolution, pits you in the final two tiers against the Vadrigar, "the Arena Master, the Supreme Being". The matches you play against him are Elimination matches, which means that, in order to win, you must deplete the lives out of your opponents. In both matches, the Vadrigar has only one life, but compensates it with a faster walking speed, a ginormous amount of health (400, when the player starts with 100 and can reach 200 at max), starts with full arsenal and armor and, in the second and last match, being able to attack you from inside his shield while you must destroy said generators before being able to attack him. It's telling of how difficult the match will be when the previous one pits you against Xaero, who's a SNK Boss of his own in the PC versions due to his pinpoint accuracy.
- In Quake Champions: Doom Edition there's Rapha, the Final Boss of the QCDE Arena mode. He uses Sarge as a champion, which means he doesn't have an active ability and his passive abilities, in normal circumstances, make him a fair champion to play against (Sarge himself is even the Tier 2 boss, and his battle isn't exactly difficult). Furthermore, the map the battle takes place (Aerowalk) is quite simple and features a lot of Z-axis play. But the Rapha bot takes things too far in an unfair way. He snipes the player as soon as he sees them, rails them from afar, prevents them from taking items, etcetera. While the player did encounter him in the prior two matchesnote , the presence of the other bots made things more bearable. At least the game tells you in a subtle way that you're in for a ride: Rapha was named, after all, after a veteran pro player of the Quake Champions scene.
- The Superboss of Splatoon 2: Octo Expansion, Inner Agent 3, is an incredibly overtuned version of a player character. The entire fight is a Marathon Boss that involves five different phases, each of which has Agent 3 spamming one of five Special Weapons with destructive regularity, with the occasional Autobomb in between. In order to progress the fight, enough damage must be dealt to break Agent 3's armor, but Agent 3 can Unnecessary Combat Roll at any given time (an ability usually restricted to the Dualies weapon class, whereas Agent 3 uses a Shooter), is far more durable than you in a given phase, and has Regenerating Health. Agent 3 also has roughly 80% perfect aim, has virtually unlimited ink, and will lay waste to you if you don't strafe or haven't managed to ink a path out of harm's way. The entire fight is situated in a 10m x 10m flat box with exactly two solid structures in it, making evasion and recovery extremely hard. Oh, and Agent 3 also has a UFO. If you get splatted at any point in the fight, you have to restart the entire battle from the very beginning. The running joke in the fandom about this boss is the game basically pitting you against a Splatoon hacker.

