Ending bonus
Successfully complete the game with all cogs, eggs, and opals collected for a 100% completion to unlock a bonus level and an extra FMV sequence after the ending credits.
Zoomerang
Collect ten golden cogs to unlock the Zoomerang.
Multirang
Collect twenty golden cogs to unlock the Multirang.
Infrarang
Collect thirty golden cogs to unlock the Infrarang.
Easy kills
If you have the Multirang and have to fight a group of Frills, run around in circles while throwing all of your boomerangs at once.
How to Beat The First Boss
How to attack the boss, is to stand in front of the huge rocks. Wait until he charges, then dodge sideways. Then, he will attack after your first hit against him. Jump over the shock waves whilst avoiding the hurling rocks.
Force All Hidden Objects
During the game, press L, R, L, R, Y, Y, X, B, B, X, Z, Z. This shows all items with a nasty glow.
Get Swimming And More
During the game, enter L, R, L, R, Y, Y, B, B, Y, B.
Techno-Bang
Press L, R, L, R, Y, Y, Y, B, Y, B during the game to get some technorangs.
Unlimited Health
During the main menu, press L, R, L, R, Y, Y, Y, Y, X, X.
Movies
At the main menu, press L, R, L, R, Y, Y, A, A, Z, B, Z, B.
Restore Health
If you're low on health, dive into the water and resurface--you'll emerge with full health.
Rainbow Cliff: Easy lives
Whenever you return to the Rainbow Cliff area from another area, there is a free life icon that you can pick up. Follow the dead end gully that is to the right of Julius' lab. The icon is at the end. You can go back and forth from any level to Rainbow Cliff as many times as desired to get this free life every time.
Snow Worries: Crossing ice
Go to where the very thin ice is when getting the Golden Cog. Walk as slowly as possible and the ice will not break.
Two Up: Frill kill
When you have to get the Thunder Egg, collect over 100 Opals then go by the Frills (but not too close). Hold Bite and wait until Ty starts to turn blue. Then, point Ty towards a Frill and release Bite. Ty will kill all the Frills.
Finding items
Look behind waterfalls. There is usually an item hidden there.
Restore health
If you are hurt, jump in water then get out. You will now have full health.
Elemental Rangs
Press L, R, L, R, Y, Y, Y, B, Y, B. This will allow you to get all of the rangs from the series of techno rangs. Now here's the cool part! After you beat the first boss, you will have all of the elemental rangs including the Firerang, the Frostyrang, and the Zappyrang! That one's my favorite!