Player 1:
A/D for movement, W to jump, S to shoot, [space] to use special
Player 2:
Left/Right arrows for movement, Up arrow to jump, Down arrow to shoot, / to use special
Player 3:
G/J for movement, Y to jump, H to shoot, 5 to use special
Player 4:
{ / | for movement, = to jump, } to shoot, - to use special