Start the game with the command line parameter '+set cheats 1 +set ui_console 1 +set developer 1' then press Alt + '~'(tilde) key to open the console.

God Mode:
Dog

Enemies Ignore You:
Notarget

Full Health:
Fullheal

Any Level (double-click map name):
Maplist oad

Tommygun and M1 Carbine:
Wuss

No Clipping Mode:
Noclip

Show FPS
Fps 1


Spawn Items
During game play presss Alt+ '~' (tilde) key and enter 'Spawn' with any of the following codes to unlock the corresponding.

Spawn Shotgun:
Weapons/us_riot.hag

Spawn M1 Carbine:
Weapons/m1_carbine.hag

Spawn M2 grenade:
Weapons/m2frag_grenade.hag 1

Spawn Satchel Charges:
Weapons/us_demolitionpack.hag 3

Spawn Axe:
Weapons/us_axe.hag

Spawn BAR Squad Automatic Weapon:
Weapons/us_bar.hag

Spawn Block of C4:
Weapons/satchel_charge.hag

Spawn Japanese Grenade:
Weapons/jpnfrag_grenade.hag

Spawn Johnson LMG:
Weapons/Johnson.hag

Spawn Katana Sword:
Weapons/sword.hag

Spawn M1 Garand:
Weapons/us_garand.hag

Spawn M1903 Springfield Rifle:
Weapons/us_springfield.hag

Spawn M1911 Colt:
Weapons/us_colt45.hag

Spawn M1917 Revolver:
Weapons/us45.hag

Spawn M44 Carbine:
Weapons/jpn_44.hag

Spawn M55 Reising SMG:
Weapons/Reising.hag

Spawn M96 Lgm:
Weapons/jpn_model96lmg.hag

Spawn M97 Sniper Rifle:
Weapons/model97_sniper.hag

Spawn Nambu Pistol:
Weapons/nambu_pistol.hag

Spawn Springfield Sniper Rifle
Weapons/springfield_m1903_sniper.hag

Spawn Thompson with 30 Round Magazine:
Weapons/us_thompson_30.hag

Spawn Thompson with 50 Round Drum:
Weapons/usthompson.hag

Spawn Type 100:
Weapons/type100_smg.hag