Use left and right arrow keys to move the gun left and right. You reduce a number by shooting it with its prime factors. Each time a prime factor hits a number, the number is divided by that factor. If the number is a prime number you can shoot it with a special "P" ("P" for "prime") missile which reduces it directly to 1. To fire a 2, 3, 5 or 7, just type the corresponding key on the keyboard. To fire 11, 13, 17 or 19, type the first letter of the number (in lower case), i.e. "e" for 11, "t" for 13, "s" for 17 and "n" for 19. Type "p" (lower case) to fire the "P" missile. In all cases a number is "dead" when it is reduced to 1. If a number hits you, then you're dead.
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