Invincibility
At the mission selection screen, press R, Z, C-Down, R, C-Down. If you entered the code correctly, the phrase "Ah, that's better" will be spoken.

Infinite ammunition
At the mission selection screen, press C-Up, Z, C-Left, Z, L. If you entered the code correctly, the phrase "Ah, that's better" will be spoken.

7.65 silencer gun
At the mission selection screen, press C-Up, L, C-Right, C-Left, C-Up to receive a 7.65 silencer gun with 30 rounds. If you entered the code correctly, the phrase "Ah, that's better" will be spoken.

9mm high-power gun
At the mission selection screen, press R, L, C-Down, C-Up, C-Up to receive a 9mm high-power gun with 30 rounds. If you entered the code correctly, the phrase "Ah, that's better" will be spoken.

Uzi
At the mission selection screen, press C-Right, C-Left, C-Right, C-Down, R to receive an Uzi with 30 rounds. If you entered the code correctly, the phrase "Ah, that's better" will be spoken.

Mini-rocket launcher
At the mission selection screen, press R, L, C-Left, C-Right, C-Down to receive a Mini-rocket launcher with 30 rockets. If you entered the code correctly, the phrase "Ah, that's better" will be spoken.

Easy mode
At the mission selection screen, continuously tap C-Up, Z. During this time, Ethan will rapidly say ''Ah, that's better". If done correctly, the game will begin without turbo mode, but with almost double health. Hits will also inflict less damage.

Turbo mode
At the mission selection screen, press C-Up, Z, C-Up, Z, C-Up. If you entered the code correctly, the phrase "Ah, that's better" will be spoken.

Kid mode
At the mission selection screen, press C-Down, C-Up, R, L, Z. If you entered the code correctly, the phrase "Ah, that's better" will be spoken.

Big head mode
At the mission selection screen, press C-Down, R, C-Up, L, C-Left. If you entered the code correctly, the phrase "Ah, that's better" will be spoken.

Giant head mode
At the mission selection screen, press C-Down, L, C-Up, C-Right, L. If you entered the code correctly, the phrase "Ah, that's better" will be spoken.

Big feet mode
At the mission selection screen, press C-Down, R, Z, C-Right, C-Left. If you entered the code correctly, the phrase "Ah, that's better" will be spoken.

Bonus level
Beat the game and wait until Infogrames logo disappears after the ending credits. Then, the development team will appear on the Embassy level. Speak to all the people here and then Ethan and Candace will enter the room.