There's a demo for a game called Rollin' Rascal that's basically a Sonic clone, but there's a multiplayer racing portion of it that's actually really fun. There's no stakes, it's just competing for the sake of winning, and it's really fun trying to figure out where the best routes would be. You can customize your "rascal" with different color palettes, or you can make a couple color schemes of your own, and give him a hat if you want.

The demo has two campaign levels available, but I'd still recommend it for the multiplayer racing aspect.