to shoot press space. to switch the hand your holding the gun press left and right. the black gun is the one that shoots. If three zombies or more touch you at the same time u get turned into one. press g to be invisible for 0.1 secs. BEWARE holding it is not enough to hold off three or more zombies! u also have to shoot.... muhhahahaha ENJOY YOUR LAST FEW MINUTES OF NOT BEING A ZOMBIE!