1. Enter the Steam control panel then select the "My games" tab.

2. Right Click the "Left 4 Dead 2 Demo" option then select "Properties".

3. Select "Set Launch options" then enter -console and accept it.

4. Start the game, and the console window should now appear.

5. Enter bind p toggleconsole as a console command. Click and close the
console window and start a single player game.

6. Press "P" during game play to display the console window, then enter
sv_cheats 1 to enable cheat mode.
If the message "Can't use cheats now; please exit to main menu and start your
own listen
server with "map mapname" so that you could enable cheats." appears, enable the
map c5m1_waterfront or map c5m2_park code. You will return to the main menu.
Enable either map code again, then enable the sv_cheats 1 code again.

You can now enter one of the following codes.

Effect Code

Toggle God mode for entire team - god [0 or 1]
Gain health - give health
Defibrillator - give defibrilator
Adrenaline - give adrenaline
First aid kit - give first_aid_kit
Pain Pills - give pain_pills
Commit suicide - kill
Quit game - quit
Toggle no clipping mode - noclip
Toggle Incendiary Ammo upgrade - upgrade_add incendiary_ammo
Toggle Explosive Ammo upgrade - upgrade_add explosive_ammo
Toggle Laser Sight upgrade - upgrade_add laser_sight
Grenade launcher - give weapon_grenade_launcher
Hunter claws - give melee
Combat rifle - give rifle_desert
AK-47 - give rifle_ak47
Sniper rifle - give sniper_military
Magnum - give pistol_magnum
Silenced SMG - give smg_silenced
Chrome shotgun - give shotgun_chrome
SPAS shotgun - give shotgun_spas
Nightstick - give tonfa
Boomer Bile - give vomitjar
Guitar - give electric_guitar
Frying pan - give frying_pan
Machete - give machete
Double pistol - give pistol
Pump shotgun - give pumpshotgun
Auto shotgun - give autoshotgun
SMG - give smg
M16 - give rifle
Sniper rifle - give hunting_rifle
Molotov cocktail - give molotov
Pipe bomb - give pipe_bomb
Propane tank - give propanetank
Gas can - give gascan
Oxygen tank - give oxygentank
Refill ammunition - give ammo
Toggle unlimited ammunition - sv_infinite_ammo [0 or 1]
Spawn Spitter - z_spawn spitter
Spawn Jockey - z_spawn jockey
Spawn Charger - z_spawn charger
Spawn common zombie - z_spawn zombie
Spawn zombie mob - z_spawn mob
Spawn Boomer - z_spawn boomer
Spawn Hunter - z_spawn hunter
Spawn Witch - z_spawn witch
Spawn Smoker - z_spawn smoker
Spawn Tank - z_spawn tank