Mission: Impossible 

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.