Play Happy Wheels Games by Jim D. He developed the game to play online for free. You can play more game on including Run 2 and Run 3 on this website. Happy Wheel looks scary game but in real it a very user friendly and easy to play game like Heart Cards Games and you can play this game to play with friends.
Playing this game online for free is very easy even though this is Happy Wheels Demo but you can still play long version of it. The instruction are :
Z = Eject
Spacebar = Primary Action
CTRL+SHIFT= Secondary Action