Unlimited ammunition:
Before loading a game, enter the options menu, select
"Game Settings", then "Cheats". Enter L1,
L2, X, R2, R1 as a code.

Grenade bullets:
Before loading a game, enter the options menu, select
"Game Settings", then "Cheats". Enter X,
Circle, Square, L2, R2 as a code.
Invincible player:
Before loading a game, enter the options menu, select
"Game Settings", then "Cheats". Enter Up,
Square, Circle, X, Down as a code.

One shot kills:
Before loading a game, enter the options menu, select
"Game Settings", then "Cheats". Enter Circle,
L2, Down, R1, X as a code.

All Acts unlocked:
Before loading a game, enter the options menu, select
"Game Settings", then "Cheats". Enter R2,
Right, L2, Up, Square as a code.

All bonus features unlocked:
Before loading a game, enter the options menu, select
"Game Settings", then "Cheats". Enter Left,
R1, L1, Down, Circle as a code.

Concept artwork:
Complete the indicated Episode to unlock the corresponding
concept art.

Avatar Twin: Episode 3 as Scully
Constantine Creature: Episode 3 as Scully
Constantine: Episode 3 as Scully
Crazed Postal Zombie: Episode 1 as Mulder
Disciple A - Harvester: Episode 2 as Mulder
Disciple A - Harvester (additional): Episode 2 as Scully
Disciple C - Pyro: Episode 3 as Mulder
Disciple C - Pyro (additional): Episode 2 as Scully
Disciple D - Pitcher: Episode 3 as Mulder
Disciple E - Avatar Twin: Episode 3 as Scully
Disciple F - Avatar Twin (additional): Episode 3 as Scully
Hector Zombie: Episode 1 as Mulder
Hector Zombie (additional): Episode 1 as Scully
Mutant Slug: Episode 3 as Mulder
Mutant Wolf: Episode 2 as Mulder
Mutant Wolf (additional): Episode 1 as Scully

Behind the scenes videos:
Complete the indicated Episode to unlock the corresponding
video.

Byers: Episode 1 as Scully
Cigarette-Smoking Man: Episode 1 as Mulder
Krycek: Episode 2 as Mulder
Langly: Episode 2 as Scully

Storyboards:
Complete the indicated Act to unlock the corresponding
storyboard.

101 through 115: Episode 3, Act 2 as Scully
20 through 27: Episode 1, Act 1 as Scully or Mulder
28 through 32; 37 and 38: Episode 1, Act 2 as Scully
33 through 36: Episode 1, Act 2 as Mulder
39 through 41: Episode 2, Act 1 as Mulder
42 through 55: Episode 2, Act 2 as Mulder
56 through 59: Episode 2, Act 1 as Scully
60 through 73: Episode 2, Act 2 as Scully
74 through 84: Episode 3, Act 1 as Mulder
85 and 86: Episode 3, Act 1 as Scully
87 through 100: Episode 3, Act 2 as Mulder

Hint: Unlimited first aid kits:
When making the optical disc in Episode 2, if you type
in the Chris Barnes code first, you will get a first aid kit.
You can type it in as many times as desired.



Hint: Defeating the Harvester:
Use the following trick at the end of the first episode
when you battle the Harvester and the three possessed females.
After the intermission sequence with Scully (when you are playing
as Mulder), equip the pistol and move a few footsteps. Aim directly
at the Harvester to the left. Avoid the females and blast the
Harvester. He will go down in seconds.