Rumble Box is a free 3D fighting game for Windows with a unique twist: All of the game's characters are made out of cubes and spheres, and when they're defeated their component parts stick around to litter the arena floor. The goal of each level is to escape the arena, which can only be done when there's enough "body parts" piled up that you can climb up and over the wall. Gameplay is fairly simple with only a handful of moves, but the ceaseless torrent of baddies and the constantly changing landscape make Rumble Box a fast-paced game that's hard to put down. Beware, though, it does take a bit of processing power, and with an underpowered video card you could experienced some slowdowns on the larger levels.