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Chaos is a water-like creature that appears in the Sonic the Hedgehog franchise. He is known for his ability to change form every time he gets a Chaos Emerald, eventually turning into Perfect Chaos when he has all seven.
Super Smash Bros. series
Super Smash Bros. Brawl
Super Smash Bros. Ultimate
Mario & Sonic at the Olympic Winter Games
Chaos makes two minor appearances in the Wii version of Mario & Sonic at the Olympic Winter Games. One is as a frozen version of his Perfect Chaos form, which appears in the Sonic World version Dream Figure Skating as an obstacle and needs to be defeated by jumping into him. He also appears as a VIP member that gives the player 100 Star Points when spotted.
Official profiles and statistics
Super Smash Bros. Brawl sticker