http://games.logeot.com/mario_sonic/

Some random guy out there's making and M&S platformer, and I liked it well enough to want to spread the word. You can play as either Sonic or Mario, each have their own arc. Sonic has his traditional spindash and overall speed (and the bubble shield ability to attack if you hit C in mid air), and Mario has wall jump, ect. They both can use powerups too. I like the fire flower on sonic...

Anyway, it's apparent from the character select screen that much more will be playable later. I hope to see this game get out there.

Latest version is Beta 2.2.0 and has eleven levels for both characters. Even has a Smash Bros style multiplayer.

Wow, that's actually an intriguing concept. This is kinda what I thought Mario and Sonic was gonna be before....you know.

Nintendo, buy Sega and hop to.

I played all the way through with both characters. It's definately full of awesome.