V hlavním menu jděte do Options -> Keyboard/Mouse a aktivujte volbu Allow

Developers Console. Potom během hraní klávesou [~] otevřete konzoli a zadávejte následující kódy:

sv_cheats 1 - aktivuje cheat mód, musíte zadat před použitím ostatních

god                - neporazitelnost

noclip             - procházení stěnami

sv_infinite_ammo 1 - neomezená munice

impulse 10         - všechny zbraně a munice

Přidávání:

give ammo          - doplnění munice

give autoshotgun

give first_aid_kit

give gascan

give hunting_rifle

give moltov

give oxygen_tank

give pain_pills

give pipe_bomb

give pistol

give propane_tank

give rifle

give shotgun

give smg

NPC:

z_spawn mob

z_spawn witch

z_spawn tank

z_spawn boomer

z_spawn smoker

z_spawn hunter

Zmena levelu:

changelevel l4d_hospital01_apartment

changelevel l4d_hospital02_subway

changelevel l4d_hospital03_sewers

changelevel l4d_hospital04_interior

changelevel l4d_hospital05_rooftop

changelevel l4d_smalltown01_caves

changelevel l4d_smalltown02_drainage

changelevel l4d_smalltown03_ranchhouse

changelevel l4d_smalltown04_mainstreet

changelevel l4d_smalltown05_houseboat

changelevel l4d_airport01_greenhouse

changelevel l4d_airport02_offices

changelevel l4d_airport03_garage

changelevel l4d_airport04_terminal

changelevel l4d_airport05_runway

changelevel l4d_farm01_hilltop

changelevel l4d_farm02_traintunnel

changelevel l4d_farm03_bridge

changelevel l4d_farm04_barn

changelevel l4d_farm05_cornfield

changelevel l4d_vs_hospital01_apartment

changelevel l4d_vs_hospital02_subway

changelevel l4d_vs_hospital03_sewers

changelevel l4d_vs_hospital04_interior

changelevel l4d_vs_hospital05_rooftop

changelevel l4d_vs_farm01_hilltop

changelevel l4d_vs_farm02_traintunnel

changelevel l4d_vs_farm03_bridge

changelevel l4d_vs_farm04_barn

changelevel l4d_vs_farm05_cornfield

                                                 (zdroj : www.abcgames.sk)