TileMan.IO is an online multiplayer game that is categorized IO game. In this game, you become a dot that travel around and fill up the field with your tile color.
In this game, you play as a dot which shades the field with your color, the larger area you shade the higher ranked you get.

You only need to draw the border connect to your old area, and the new area will be shaded itself. However, you need to be aware of other players, as if they overwrite your border, you will die. And you can kill the others in the same way, too.

Gameplay Tileman.IO:

WASD or arrow key to move. E, P or number 5 to stop.