I recently found an extremly addictive game named toribash
Toribash is an innovative fighting game based on the physics sandbox model where YOU design the moves! Join us today, and pit your skills against other players all over the world.
Earn Toricredits by winning matches, then customize your character in the store! Trade items with other players. Win prizes in weekly tournaments. Climb the rankings. Earn your own Black belt. Better still: be one of the few who make it to 10th Dan!
Toribash is Addictive! Try Wushu, Sumo, Kick Boxing, Sambo, Swords, Judo and more. Create fighting movies and post them on YouTube. Watch other players fight. Chat with them. Defeat them!
Most of all: IT'S FREEWARE!