Celestia.io is a 2D multiplayer game in which you are a furry ball in floating around in outer space.
Antwar.io is a 2D multiplayer battle game. In this game, build the colony with ants under the ground and protect the queen ant. An epic battle with your friends against other rival colonies. Antwar.io is here as Unblocked.
CurveFever.io is a superbly concucted extremely addictive game that has awesome graphics. The creators of the game have received much respect in the gaming community for having created this particular game.
Arraw.io is a 2D multiplayer archery game that is played in a green environment in which you can move with your arrow keys on your keyboard and shoot using your mouse.
AirMa.sh is 2D multiplayer air battling game in which you utilize your arrow keys on your keyboard to move around and your space bar to shoot missiles at your enemies.