Spy vs. Spy

Enter PROHIAS as a code.

Successfully complete the Mansion level in story mode.

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

To make your HUD invisible, insert the following password at the in-game password screen: BLINK.

From the main menu, go to the "Extras" screen. Then go to "Cheats" and there's a field to enter Passwords. Enter "ARMOR" and press "Enter."