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DVD Eggs

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Cheat Codes (DEMO VERSION)
Enable the console from the game's in-game options. Hit the tilde key (~) to drop the dev-console. Type "seta thereisacow 1337" and then press ENTER. Type spdevmap bog_a and then press ENTER. This will start the demo with cheats enabled. When playing, drop down the dev-console and enter the following codes and hit ENTER to activate or toggle them.

give all: Access All Weapons
god: God Mode
noclip: No Clipping Mode
notarget: Enemies Ignore You
give ammo: Full Ammo
jump_height #: Adjust Gravity (Default = 39)
timescale #: Adjust Time (Default = 1.00)
cg_LaserForceOn 1: Add Laser Sight to All Weapons

Cheat Codes (RETAIL GAME)
Enable the console from the game's in-game options. Hit the tilde key (~) to drop the dev-console. Type "seta thereisacow 1337" and then press ENTER. Type spdevmap bog_a and then press ENTER. This will start the game with cheats enabled. When playing, drop down the dev-console and enter the following codes and hit ENTER to activate or toggle them.

give all: Access All Weapons
god: God Mode
noclip: No Clipping Mode
ufo: No Clipping Mode
notarget: Enemies Ignore You
give ammo: Full Ammo
jump_height #: Adjust Gravity (Default = 39)
timescale #: Adjust Time (Default = 1.00)
cg_LaserForceOn 1: Add Laser Sight to All Weapons
give <item> - Gives you an item. put all for all weapons
demigod - God mode but your screen still shakes
r_fullbright - Way easier to see stuff this way :)
cg_drawGun - Get rid of your gun
cg_fov - Lets you zoom with any gun

Epilogue Mission
If you sit through the credits at the end of the game, there's one more mission available.

Epilogue Mission: View the ending credits to unlock one final mission

Unlock Arcade Mode and Cheats Option
After completing the game, these options are automatically awarded to you.

Arcade Mode: Complete the game on any difficulty.
Cheats Menu: Complete the game on any difficulty.