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agma io is a widely popular 2D online action game. In this game, players command a cell which looks like a ball.
Battle! Combat Strike 6 is a cool multiplayer online first individual shooter by a99 Games.
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.
DogFightx.com is a 2D multiplayer game in which you have control over an aircraft. You will fly through the playing field and dodge bullets, bombs, etc. maneuverability is key in this game.