Unlock fifteen or more secrets and complete game play under any difficulty
level to fly in one of the small Earth fighters. Complete the game under
the hard difficulty level without continuing more than two times to fly in
one of the Moon fighters from the final level.
Complete game play with a high ranking to access a "Gallery" option from
the main menu. Select it to view various graphics depicting the ships,
weapons, and battles in the game.
Start with gunpods:
Begin game play and reach a point where various gunpods have already been
obtained. Intentionally lose the game and use all remaining lives. Allow
the timer to reach zero on the continue screen. Allow the title screen to
reappear and select "Game Start". Select a ship and equip it as desired
with the gunpods that are now available. The selected gunpods will also
reappear automatically as a standard weapon after a life is lost during
the next game.
Defeating the level 3 Boss:
Note: This is the boss with the self-propelled fist and "yo-yo" shoulder
weapon. When the boss starts firing its homing bombs, try to fly behind
it. If done correctly, the bombs will fly downward to follow you, and hit
the Boss' head. This causes significant damage to the boss, allowing it to
be defeated after two or three hits.