Cheat Codes

This game has a bunch of cheat codes. Only six of them were published in cheat books, and they're kind of boring – they just unlock the minigames so you can play them from the main menu. The rest are somewhat more interesting.
 

Credits and SCredits warp you to the full credits and the Saffire credits, respectively. It's unclear why they chose this route as opposed to having a "Credits" option on the main menu, like in the demo.

Saffire warps you to the final lavaboard sequence.

 

Finally, EvilGeorge and DiePinky recolor Takua to use a unobtainable color schemes. This isn't saved, so if you quit and reload your save, Takua will be colored as normal. My best guess is that these cheats were meant to test the contrast of the GBA, to make sure that dark and bright sprites were equally visible on the non-backlit screen. "EvilGeorge" is probably a reference to Takua's development name, George, which was also used internally by Templar Studios while they were making MNOG.

UPDATE 5/25/20: The six codes used to unlock minigames are actually a combination of each Toa's mask and canister codes! For example, Lewa's mask code is 3-LT, and his can code is 154, so the cheat code that unlocks Kewa Bird Riding is 3LT154. This feature is mentioned offhand in early press releases, but not in the game manual or either walkthrough. Weird!