Happy Wheels is a ragdoll-physics-based flash game created by Jim Bonacci. Players control various unique characters with their goal being to get to the finish line and avoid being splattered across the level by many hazards and obstacles. Users may create and share their own custom scenarios using the expansive level editor, or play some of the millions of already-existing user-made levels. The game is most notable for its dark sense of humor and its large amounts of gore. Bonacci was motivated to make the game out of disappointment of other ragdoll-physics games, stating that "No one was making their ragdolls die properly. They'd usually flop around harmlessly or in some instances have the same canned animation over and over."
The demo of Happy Wheels has been available on many sites including Newgrounds and OneMoreLevel, but you can only play the full version of the game at Total Jerkface (Bonacci's website) since May of 2010.