Sv_cheats 1 does work
Enable developers console from options keyboard/Mouse
then enter bind p toggleconsole.
then still at the main menu,enter map c1m1-4 or c2m1-4 or whatever it says but in map c1 or 2 or 3 or 4 5,6.
Then lastly while still in the game enter sv_cheats 1 enter.Then enter any of the desired cheats written up at Super Cheats my personal favorite is z_tank_health 999999999999999 Its freakin INTENSE.
If you need more help, we've got more Left 4 Dead 2 cheats and also check out all of the answers for this game
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