Unlock Missile Command
To unlock, go to Level 7 - Hollywood. Once you destroy the refuelling station head left into the room, where there is an arcade machine. Press X in front of it to play and unlock Missile Command. You can now play this in the Special Features.

Defeat the Infiltrator:
This Boss battle will be your mission in level 5. Press the buttons as instructed by the bottom captions. Do this at random so that the Infiltrator cannot predict your attack. When his health is down by 24, he will get a limp leg which will slow him down.

Cheat menu:
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 "All upgrades" cheat option will now be unlocked.

Invincibility:
Select the "Credits" option at the main menu, then press X, Z, R while watching it. The "Invincibility" cheat option will now be unlocked.

Cheat options:
The cheat options are unlocked for every 10,000 points scored in the game. 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 (Unlimited scan vision)
Instant Death
Invincibility
Deathstare (automatically kill anything targeted)