Legend of the Mystical Ninja

Game Cheats:
Alternate costumes:
Collect all 30 Elephant Statues to unlock new costumes for all four characters.

Mystical Ninja History Lessons:
Also, have the Game Boy Advance game Kessakusen! Ganbare Goemon 1+2 inserted.
At select locations throughout the game, various characters from the Game Boy
Advance game will appear and tell you things about Goemon's past.

Space-Manbo mini-game:
Have the Game Boy Advance game Kessakusen! Ganbare Goemon 1+2 inserted. At
the mini game menu, Space-Manbo will now be unlocked.

Goemon New Age Shutsudou! reference:
In the second town's underground prison, New Aged Goemon can be found occupying
the second jail cell for his "crimes against the Goemon franchise".