Save the child potential and escape via the roof helicopter. Controls: Use the arrows to run around, 'x' key to shoot, the space bar to jump, and 'z' is grenade. Alternate controls: Numbers 4, 8, 6 and 2 move you, space bar jumps, 'x' is to shoot and 'z' is grenade. Mac user controls: Use the arrows to run around, apple/control to shoot, space bar to jump, and shift is grenade. Alternate Mac controls: Numbers 4, 8, 6 and 2 move you, space bar jumps, apple/control to shoot, shift is grenade.