Change Globe Size (CD version)
At the Mission Select screen, press Up or Down to change the size of the globe.
Change Globe Speed and Direction
At the Mission Select screen, press 4 + 6.
Change Ground Texture
To change the ground texture, press Up + A + B + C + 3 while playing.
Change Monitor Frame
At the Mission Select screen, press Right + C + 1 + 4 + 5 to change the appearance of the monitor frame.
Change Music (cartridge version)
Press Up + B + C + 0 to change music tracks while playing.
At the Mission Select screen, press 3 + 6 + 9 + #.
To advance a level, press 2 + 4 + 6 + 7 + 8 + 9 while playing.
At the mission select screen press 2 + 3 + 6 + Up. A new level will appear when you scroll through the levels.
Night comes quick in these parts. To bring it on faster, press Up + A + B + C + 7 while playing.
Unlimited Weapons, Energy and Shields
At the Mission Select screen, press Down + 3 + 4 + 6 + 7.