1. No idea, I play solo with mods, never had any trouble. 2. Use any mods you want, but your friend has to have the exact same setup as you or it won't let them join you. 3. Yes, you will have to merge the mods but it's really easy. (Really.) The mods you listed all still work with the most recent release. More time for the Bozak horde doesn't need to be merged, it goes in a different folder than all the other mods. Modding for Dying Light: all *.pak files for Dying Light are actually zip files. Note: Use Winzip or Bandizip, not winrar. a. Change the file extension to .zip, and extract them to a new folder. b. Put all the files from the mods you want to use in that folder, rename it to Data3, and zip it up. c. Then change the file extension to .pak so you have your new Data3.pak. d. Put the Data3.pak you made in the Dying Light\DW folder, replacing the empty one the game ships with. Now when you start your game, you will get a message that you are using modified files. Accept it and play! Take notes on everything you change so you can make sure your friend's setup is identical.