Casino Night Zone

Casino Night Zone (not to be confused with the Carnival Night Zone from Sonic 3) is the fourth level of Sonic the Hedgehog 2 for the Sega Mega Drive, coming after Aquatic Ruin and before Hill Top Zone. 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.

The Zone also features as a racetrack in Sonic Drift 2 for theGame Gear.

The origins
Casino Night is, predictably, a sprawling casino. At night, Jaunty electric colours and pinball flippers abound, as well as slot machines where Sonic can rack up hundreds of rings if you're lucky enough to get the right combinations. Bounce-able tiles flash green, yellow, then red as you hit them, enabling Sonic to rack up points. The level also features steely blue elevators, which convey Sonic upwards or downwards depending on the specific lift.

Geographically, the Zone is located somewhere on Westside Island. Why Robotnik would make a casino on an island whose inhabitants he is in the process of roboticizing into soul-less (and money-less) badniks is a mystery for the ages. However, there is the possibility that the casino was built by somebody other than Robotnik.

Speaking of badniks; this Zone contains only one kind: the Crawl, called "Guardon" (ガードン) in the Japanese manual. It has a bumper included, so if you try to perform a spin attack from the front it'll bump you away! So, you have to jump over it and quickly attack from the back as the only method of destroying it.