Sonic Cameo's
Daytona USA - In the beginner track on the hardest turn, sonic's carved into the rock {Sonic's tip - stay in the right hand lane to do this turn at top speed}
Virtua Fighter 2 - In Chicago, Sonic's painted on the wall
On TV with a Filthy, Dirty, Disgusting, Skanky, Brutal, Bottom Feeding Trash Bag Ho named Rosie O'Donnell
World Series Baseball '95 (Game Gear Version)- In "create team" if you don't name your teams
team 1 is sonic and team 2 is tails
Bug! - You race sonic in a Special Stage
Super Mario World 2: Yoshi's Island - In one level you have to watch out for blue hedgehogs
Wacky Worlds - Sonic & Tails are on the cover and Tails is in the game (Don't be fooled, this game totally reaks of grade A monkey %#+!)
The game - they give you a background and you place objects on it.
Donkey Kong Country 2 - In Cranky's Video Game Hero Awards, on the floor is Sonic's Shoes