No power suit
Enter I, II, I, II, I, II, I, II, I, II, I, II, I, II, I, II, Up, Left, Down, Right, Run at the title screen.
Sound test
Press II, I, II, I, II, I, Run at the title screen.
Unlimited credits
Press Up, Up, Down, Right, Right, I, Up, Left, II, Run at the title screen.
Full life
Press Down, Left, Up, Right, Run at the title screen.
Nine credits
Press Up, Down, Left, Right, Run at the title screen.
Full weapon
Press I, I, I, II, Right, II, Select, Run at the title screen.
Easy difficulty level
Press Select, II, I, Down, Select, Run at the title screen.
Hard difficulty level
Press Select, I, II, Up, Select, Run at the title screen.
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