At the main menu, select "Options," then "Keyboard/Mouse." Enable "Allow Developers Console." During gameplay, press "~" to access the console. Type in "Sv_Cheats 1" and press "Enter" to enable the cheats. Then, enter any one of the following:

Code	Effect
map [map name]	Start LAN server; enable while in "Campaign Lobby" screen
changelevel [map name]	Quick change map
tongue_range [#] (Default 750)	Sets the maximum range of the smoker's tongue attack
z_witch_burn_time	Amount of time before a burning Witch dies from fire (does not affect damage caused by fire)
z_health	Change Zombie Health
z_speed	Change Zombie Speed
director_no_human_zombies 0/1	Disables/enables controllable Boss Infected on any map
director_panic_forever 0/1	Enables/Disables never ending panics.
director_force_panic	Forces a panic event
give ammo	Full Ammunition
give pistol	Get Pistol
give autoshotgun	Gives auto shotgun
give health	Gives full health
give gascan	Gives gascan
give hunting_rifle	Gives hunting rifle
give molotov	Gives molotov
give oxygentank	Gives oxygen tank
give pain_pills	Gives pain pills
give pipe_bomb	Gives pipebomb
give propanetank	Gives propanetank
give rifle	Gives you an Mk 47 (machine gun)
give first_aid_kit	Gives you first aid kit
z_spawn weapon_SMG	Gives you the SMG.
god	Invincibility
director_no_mobs [1/0]	No mob rushes
firstperson	Play in first person (default); this cheat is only necessary if thirdperson mode is enabled
z_witch_damage [#]	Sets the amount of damage a Witch's attack does.
thirdperson_mayamode	Sets the camera to be fixed in place while in either third person or third person shoulder mode. Enter once to turn on and enter again to turn off.
thirdperson	Sets the camera to be in third person mode.
thirdpersonshoulder	Sets the camera to over-the-shoulder third person mode
z_common_limit	Sets the maximum amount of regular zombies
z_tank_health [#]	Sets the maximum health of the Tank
z_frustration_lifetime [#]	Sets the number of seconds until the player loses control of the Tank from not attacking survivors
sb_friendlyfire [1/0]	Sets whether or not bots (and only bots) are allowed to do friendly fire damage
director_stop	Shuts off all wanderers, mobs, specials, and bosses
z_spawn zombie	Spawns 1 Zombie
boom	Spawns a active pipebomb under you.
fire	Spawns a lighted molotov right on the floor under you.
z_spawn [bossname]	Spawns a special infected (infected names:hunter,boomer,smoker,witch,tank)
z_spawn mob	Spawns a zombie horde
z_spawn boomer	Spawns boomer at location of crosshair
z_spawn hunter	Spawns hunter at location of crosshair
z_spawn smoker	Spawns smoker at location of crosshair
z_spawn tank	Spawns tank at location of crosshair
noclip	Toggles No Clipping Mode
z_witch_allow_change_victim [1/0]	True/False setting that allows the witch to change targets instead or focus on the one survivor that alerted her first
sv_infinite_ammo 1	Unlimited Ammunition
retry	You can unlock achievements while using cheats (after entering sv_cheats 1, enter retry so that it will restart the game with the cheats on)