The controls are as specified for each character at the bottom of the screen. The up-most control is fire a rocket that can kill players on a direct hit and destroy sections of line (once per round) and the lowest control is the stealth jump, your character teleports forwards a bit (once per round.)
4-player tron game. Use the controls stated. The rocket can destroy other players and walls, and the stealth jump teleports you forward a little bit. To turn off unwanted players, go into the stage scripts, and change the 'set (player) state to 1' script to 'set to 0'