Game Breaker/Video Games/Party Game

Game Breakers that don't fit into any of the other categories.

New Media

In the parodic Let's Play Sonic the Hedgehog 2 Special Edition, playing as Knuckles the Echidna makes any level a cakewalk. In addition to gliding and climbing walls, he can jump really high (as in, high enough skip entire levels in a single bound or to almost leave Mobius' atmosphere) and he can summon artillery support to take out Robotnik in a single shot.
Alluded to in the title of PC gaming site Rock Paper Shotgun.

Subverted in Magi-Nation. A power gem could be bought for 8 animite and sold for 12 animite. However, while animite is the currency of the realm, you never need to buy items, as you can recover health naturally, and you need infused animite anyways to forge rings. Basically, its a game breaker in the most technical sense that you need animite, but you don't need it that badly.

The NES version of Monopoly allows the player to make offers on AI players' property, which the AI will accept a certain percent of the time depending on how high the offer is. However, since there's no limit to how many times an offer can be made per turn, the player can repeatedly offer an extremely low amount for a property and the AI will eventually agree. Effectively, this means the player can take over the entire board with ease.
In Mythic Quest, the main character's Shadow Sword is so powerful it is often accused of being a hack in that video game by other characters. All the Shadow Spells fall under this, usually ending up in one hit KO territory.