Level select
At the main menu, select the "Credits" option, then press B, Black, Y while watching it. The "Level Select" cheat option will now be unlocked.

Invincibility
At the main menu, select the "Credits" option, then press B, Black, R while watching it. The "Invincibility" cheat option will now be unlocked.

All upgrades
At the main menu, select the "Credits" option, then press B, Y, L while watching it. The "All Upgrades" cheat option will now be unlocked.

Cheat mode
The cheat options are unlocked for every 10,000 points scored in the game. Successfully complete the game to unlock all of the following cheat options:

Concept Art 1
SGT. Candy Movie
Concept Art 2
Concept Art 3
Slo-motion
All upgrades
Permavision (infinite scan vision)
Instant Death
Invincibility
Deathstare (automatically kill anything targeted)