New duds:
Get 600 Precursor Orbs.

Unlimited Precursor Orbs:
Go to an oracle statue and trade metal head skull gems to start an orb search challenge. Go to the orb and wait for the clock to turn to 00:00. Even though it says 00:00, it takes another second for the time to run out. Wait one more second, and then press to dash at the orb as soon as time runs out and the mission failed screen comes up. You will get 3 free orbs, with the option to retry!

Unlimited Precursor Orbs Secrets:
For example, if have collected 5 Precursor Orbs and you want all three Level Selects, copy the file with 5 precursor orbs 3 times into the remaining save slots, and activate Act 1 Level Select in the first file. Then activate Act 2 Level Select in the second. Then activate Act 3 Level Select in the third file, and now you can have all three Level Selects! You can use this technique for any other secret in the game.

No Damage from High Falls:
Hit right before you hit the ground and you won't take any damage from the fall.

Infinite Light Flight:
After getting the light flight move, press twice when you are light jak to begin flying. Then quickly tap (for light shield) and again when in the air. Keep repeating this to gain height and be free to explore anywhere in the game.