Arrow keys to move around.
Shoot / Bomb: Z and X keys
Pause: Spacebar / enter Cheats
-- 5 Bombs --
On the title screen, select "New Game" whenever the background animation is flashing white. If you get the timing right, you'll start with 5 bombs instead of 3!
-- Hidden 1UP --
In stage 3, just before you reach the open harbour, you'll see a blue box marked with a "?". Don't shoot at it (if you have homing missiles or a wide-spread gun, let go of the FIRE key). Try not to die either, or the debris of your ship may hit the box.
Wait until a nearby tank comes out of its base and runs over the box to break it. Taadaa! Out comes your free 1UP!
-- Invisibility Mode --
During the takeoff sequence after stage 5, press CTRL. A textbox at the bottom-right corner will pop out. Type in "go0gleypower" and after the animation (stage 6), you'll remain invisible for 20-30 seconds. Survival guaranteed!
You'll return to normal at around the time you see the ruby (which gives you a 1UP).
