Left 4 Dead 2
Left 4 Dead 2 is a single-player and multiplayer co-operative survival horror FPS game.
Play Versus Mode in Offline
To play Versus Moide in Offline. I have some suggestions below here. Scroll down and read all of them

1. If you're a Steam User playing L4D2, be sure you have type the "-insecure" in the game advanced option, prevents you connecting to VAC secured servers.

2. Open your console and type the map what do you want to start. 
map <c1, c2, c3, c4, c5> <m1, 2, 3, 4, 5> <gamemode>
Here's the examples:
- map c1m1_hotel versus
- map c1m2_street versus
- map c1m3_mall versus
- map c1m1_atrium versus

3. Type this on the console of the following:
sb_all_bot_game / sb_all_bot_team set to "1" (Prevents the server shutting down without players)
sb_l4d1_survivor_behavior set to "1" (Makes the bot change their behavior, they can lead)

4. If you want to play as Special Infected, press "m" on your keyboard and will pop-up on the L4D2 screen, note you can only switch once.

5. Done, enjoy playing Versus mode

1. If you're a non-steam user playing L4D2, right-click your .exe and put a "-insecure" in the target. Example:
"C:\Program Files\Game\Left 4 Dead2/left4dead2.exe -insecure"

2. Open the game and type this on your console:
sb_all_bot team / sb_all_bot_game set to "1"
sb_l4d1_survivor_behavior set to "1"

3. Type the map you want to play in versus. Similar to the Steam users.
map c1m1_hotel versus

4. Done! Enjoy playing Versus Mode in offline

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chaulovetran May 2017
I type all codes but sb didn't work, they just stand still and do nothing !!
SniperPro20222 March 2017
Nice guide But what has it sense when most of people plays online instead singleplayer?
kooler1 April 2017
hell, i play off line most of the time