In MachineGunner 2, you will control four players. You can use WASD to move them, and Arrow keys to fire. Use Q,E,R,F to Mark or Unmark player 0,1,2,3. Marked player is able to move but Unmarked player's position is locked. Also, you can place your players to Cover Block. When player collides with it, Soon the player's color will be turned into grey. In that state, the player is invincible. But it can't