Spy vs. Spy

Cheat mode:
Enter the "Extras" menu and select the "Cheat" option. Then, enter one of the following codes to activate the corresponding cheat function. A message will confirm correct code entry.
eaensma.

All Modern mode levels in single player mode:
Enter PROHIAS as a code.

All Story mode levels:
Enter ANTONIO as a code.

All Multi-player levels:
Enter MADMAG as a code.

All Classic mode levels:
Enter RETROSPY as a code.
A.C.

All weapons:
Enter WRKBENCH as a code.

All Spy attachments:
Enter DISGUISE as a code.
Command Station.

Invincibility:
Enter ARMOR as a code.

No items dropped when killed:
Enter NODROP as a code.

Double weapon damage:
Enter BIGGUNZ as a code.

Permanent Fairy in Modern Mode levels:
Enter FAIRY as a code.

All FMV sequences:
Enter SPYFLIX as a code.

All concept art:
Enter SPYPICS as a code.

Invisible HUD:
Enter BLINK as a code.
A.C.

Timed levels:
Successfully complete every level in Single Player Modern Mode to unlock the Timed levels.

Concept art:
For each Timed Level that is completed, you will unlock the concept art for that level.
Command Station.

Aristocrat costume:
Successfully complete the Mansion level in story mode.

Clown costume:
Successfully complete the Kooky Carnival level in story mode.

Flight Suit costume:
Successfully complete the Space Ship level in story mode.

General costume:
Successfully complete the Volcano Lair level in story mode.

Samurai costume:
Successfully complete the Space Ship level in story mode.

Soldier costume:
Successfully complete Area 51 level in story mode.

Spy-Bot costume:
Successfully complete the Robot Factory level in story mode.

Worker costume:
Successfully complete the Oil Rig level in story mode.

Zombie costume:
Successfully complete the Haunted House level in story mode.

Hint: Banjo-Tooie reference:
Play the Haunted House level. In the room with the levitating furniture, the last book is Cheato from Banjo-Tooie.
KiSsOdaDEVIL654.