During game play enter the following codes to unlock the corresponding:
Unlock Unlimited Health
Start, X, Start, Start, X, A, Y, X, B
Unlock the Level 1 Boomerangs
Start, Start, Y, Start, Start, Y, X, B, X, B
Unlock the Level 2 Boomerangs
Start, Start, Y, Start, Start, Y, B, X, B, Y
Receive 100,000 Opals:
Start, Start, Y, Start, Start, Y, X, A, X, A
Receive ALL of the Bunyip Keys:
Start, Start, Y, Start, Start, Y, B, X, B, A
Reveal ALL Items (Bilbies,Krome Orbs, Opals, ect.):
Start, Start, Y, Start, Start, Y, Up, Down, Left, Right
Enter during play:
100,000 Opals: Start, Start, Y, Start, Start, Y, X, A, X, A