Input these during the Credits Movie in the Main Menu section

Invincible Mode: X + Z + R
All Upgrades: X + Y + L
Unlock All levels: X + Z + Y


Level Selection

Select the "Credits" option at the main menu, then press X, Z, Y while watching it. This will enable level selection and the remaining cheat codes. Begin a game, then save your profile. Then, use one of the following cheat codes on that profile.

All upgrades

Select the "Credits" option at the main menu, then press X, Y, L while watching it. The cheat option will now be unlocked.

Invincibility

Select the "Credits" option at the main menu, then press X, Z, R while watching it.