Mystical Ninja [N64]

Unlimited items or gold:
Find a location that contains multiple items or gold, such as the first room in Oedo Castle. Collect the items, leave the room, then re-enter. The items will be available for recollection.

Unlock "Gorgeous My Stage" in Sound Test
To unlock ''Gorgeous My Stage'' in sound test you must save the game right before the last robot fight.

Unlock "I Am Impact" in Sound Test
To unlock ''I Am Impact'' in the sound complete the first robot battle.

Boss mode:
Collect all forty-five Fortune Dolls to unlock a boss mode selection on the options screen.

Bonus picture:
Enable the "Boss mode" code, and complete the Boss sequence.

Control Impact:
Press the Analog-stick when Impact's introduction sequence ends to move his head.

Rumble Pak bonus:
Although not an official Rumble Pak game, the Boss levels will support that peripheral.

Small Goemon:
If Goeman uses a transporter while small, it will leave without him