Unlockable modes
A number of additional archive items and game modes are available in the game,
as follows:
Unlockable How to Unlock
Space Harrier sheet music Complete the arcade version of Space Harrier.
The sheet music will appear in the archive section for that game.
Game Gear Space Harrier In the Space Harrier menu, select the Sega Mark
III version, then continue to hold right for a few seconds until the Game
Gear version appears.
Additional 3D modes In Space Harrier 3D, select the red/blue 3D mode, and
hold right for a few seconds.
Japanese Master System startup screen with Space Harrier music In the
archive mode for Sega Mark III Space Harrier, select the last image then
press Start.

PS2 Cheats for Space Harrier Collection

Space Harrier Collection cheat codes

Space Harrier Collection cheats