Left 4 Dead 2: Tip (Online Play Without Steam)
To play l4d 1 / l4d 2 visit without stim you need to go to the site “2ip” and look at your Ip address. (tell your friend what your address is, and tell him to say his.)
Be sure to turn on the internet.
Run your L4d 1 or l4d 2.
1 In the console: connect “friend’s address”, for example 123.25.25
2 In the console: map (map name) coop (or versus / survival / scavenge / realism) retreat z_difficulty difficulty (low, medium, high, hard)