Desktop Cube-Man

This is a free multiplayer PC desktop game. You can simply place the cube-man on the desktop. He has some different behavior modes, such as avoiding mouse and random shooting. He can accompany you or decorate your desktop while you are working. The most interesting part is to play with friends, you can let your friend join your desktop, then you can chat with each other or play challenge mode together. This is the first desktop game with multiplayer mode I've ever seen too.