Goemon - Mystical Ninja - Platform: Nintendo DS

Goemon GBA Link-Up Bonus:
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Turn off your DS and put Kessakusen! Ganbare Goemon 1+2 for Game Boy 
Advance into the GBA slot and the DS Goemon game into the DS slot. 
Turn on your DS and start the DS Goemon game. The GBA game acts as a 
dongle that unlocks new characters: NPCs from the GBA titles appear 
throughout the DS adventure and Space Mambo: This sidescrolling shooter 
is accessible from the mini-game menu as long as the GBA cart is inserted.

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

Goemon New Age Shutsudou! reference:
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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."