Press the console key ` and type 'cht_bEnableCheats = 3' to enable the developer cheats. Note that console commands are case sensitive.
You can access the cheats through the menu (Press ESC then press F3) or by typing them into the console. (Type 'cht' into the console and press TAB for a list of cheats.) Doing this however will invalidate your achievements and leaderboard score gained in that session. Type 'cht_bEnableCheats = 0' in the console to disable the cheats for the next session. Code: Effect: cht_bAutoAim Auto aim cheat. Cht_bShowAllNetricsaMessages Display all the messages in NETRICSA. Cht_bInvisible Enemies can't see you.
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Cht_bGhost Fly around and pass through walls. Cht_bFly Fly around. ChtGiveAmmo() Gives a specified amount of ammo for a specified weapon. Ch_slGiveArmor Gives a specified amount of armor. Cht_slGiveHealth Gives a specified amount of health. ChtGiveWeapon() Gives a specified weapon. Cht_bGiveAll Gives all available weapons and maximum ammo.
Cht_bGod God mode. Cht_bTurbo Greatly increased speed. Cht_bInfiniteAmmo Infinite Ammo. Cht_bKillAll Kill all enemies in line of sight except for bosses. Cht_bKillBoss Kill the current boss. Cht_bUnlockMentalMode Unlocks Mental Mode. (Also available through the custom difficulty menu or by beating the game on Serious).