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Nintendo 64 - Mystical Ninja Starring Goemon cheats

Unlock Boss mode option:
Find all 45 Fortune Dolls

Unlock secret picture:
First unlock Boss mode option then finish the Boss sequence.

Unlock "I Am Impact" in Sound Test 
Win the first robot battle. 

Unlock "Gorgeous My Stage" in Sound Test 
Save your game right before the final robot fight. 

Unlimited items or gold
Go to the first room in Oedo Castle. Pick up the items, leave 
the room. A few second later go back to the room. The items 
should be reappear. Repeat as many times you want.

Control Impact
Press the Analog-stic when Impact's intro sequence ends.