TileMan.io is an awesome multiplayer io game in which you must try and capture as many blocks as possible. You start with a random color of block and you must try and convert all the blocks on the map into the same color. You can convert blocks by creating a complete square - the enclosed blocks will turn to your color.
How to play TileMan.io
WASD or arrow keys to move
E, P, or numpad 5 to stop the movement