Hello people, I hope this guide will be useful!
For all who can't play in coop because the game are not saved I've found a possible solution.
You can learn about Hexadecimal numbers and how to edit the file "player.settings"(below) or you can download this with the necessary supervivence kit in the main storage of the bunker and players/maps will be available without having to complete the solo campaign here[www.mediafire.com]
On the other hand if you want to change more things, add new weapons etc join here
Nothing more to say, enjoy the game and if you have any question i will try to help you :)