Sorry if this is a noob question, but, while I'm playing duke nukem for decades I never tried making my own maps. I have played many amazing SP maps, but most of them don't have COOP mode. I would really like to play them with a close friend.
So, I wonder if is possible to edit an existing SP only map to make it work with the COOP mode? If yes, I would really appreciate your help how to do this.
![](https://forums.duke4.net/public/style_images/cgs/_custom/switch.png)