how to play more than 2 players online ???

[schmogmog]

Check out those instructions: https://lf-empire.de/lf2-empire/introduc...e-fighting
This also works: https://www.youtube.com/watch?v=CEIKMCFsUfI&t=1s
I've used a small, free game called Team Jumpers as the donor game. Depending on your bandwidth and distance this method might give you noticeable input lag.

Edit: Just saw Chiko's solution is allreaddy implemented in the mods menu and files.