Go to the passwords screen and enter 3QQQGC. Toggle from toa to toa nuva by pressing R.
Have Onua's Level Done
To complete Onua's level, just go to passwords and put in "WLBQBB".
How to get all boxers
Go to the setup menu then go to the password menu and enter the following.
H7649DH5
2GG48HD9
8G3D97B7
Takanuva
Enter password at the password menu: J+B%%%.
Unlock Lewa
Enter MVCVBB at the password screen.
Unlock Lewa and Onua
At the password screen enter this: 3GLBZB.
Unlock Lewa, Tahu, Kopaka, and Gali
Go to the password screen and enter YVVWFV.
Unlock Minigames
Unlock a selection of six minigames by entering unusual names. Start a new game and choose one of the names below as the name of your character. After the adventure begins, save your game. When you reset and select a single-player minigame, the name's corresponding game will be available.