Vector the Crocodile, Espio the Chameleon and Charmy Bee have appeared in the casino.

It is a casino-themed city located in West Side Island, decorated with operational slot machines, neon signs, and other things related to usual casinos. In the video games, Casino Night Zone is the fourth zone in Sonic the Hedgehog 2.Knuckles leaves the arena having won rings, which he grants the scavengers in favor of helping him locate Sonic. Knuckles thus breaks out of his withholding chains, and forcefully punches the beast in it's face.

The beast attacks Knuckles, which angers him. When everybody is told to place their bets, the battle ensues. Whilst hunting for Sonic the Hedgehog, Knuckles the Echidna is captured by scavengers and is brought to Casino Night, where a battle between a humongous beast and 'the last of the Echidnas' is announced. In M.U.G.E. As with most other stages in this game, Casino Night Zone consists of two standard Acts with a boss fight at the end of Act 2. Knuckles unleashes his rage ' Our challenger is a rare breed indeed-none other than the last of the Echidnas! Place your bets!' ―Announcer Casino Night Zone is the fourth zone of Sonic the Hedgehog 2 for the Sega Genesis (Megadrive), coming after Aquatic Ruin and before Hill Top Zone.

Sonic 2 casino night map