game-breaker
Term that refers to a character, item, or technique (usually in a fighting game) that is so much better than everything else, you question if the developers were asleep on the wheel when programming. Examples include Meta Knight (Super Smash Bros. Brawl), Metal Blades (Mega Man 2), and Mewtwo (Pokémon, especially in Gen 1).
The Metal Blades are such a game-breaker. The Bubble Lead attacks enemies below you, but why bother if the blades deal more damage and use half the ammo? It's ridiculous!
game-breaker by Someone you don't care about. March 16, 2021
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