The Game Can Work without using online functionality. Though it has a bit of complicated setup
Bassically you'll have to use the command prompt to run the following.
"File Location*" "SERVER1"
Where file location* = the exact path of the executable.
This runs a local host on your CPU for the servers, and allows you to play the game.
Were going to also see if we can get maybe s better server setup that stays round too but for now try using the above! (I'll also update the game with instructions for single play in a while)