I'm glad you like the game. Thanks for the bug report.
I made a hotfix, adding custom groups should work now in the new version 1.3.1 without issues.
You need to right click on the zip folder. Then click extract all, that will extract the folder. Inside the folder is the Warrior Cats Hunger Games.exe, clicking this file will start the game.
This game will not receive updates, because I am working already on the sequel Claw Games. The sequel will have an online version.
You can create new cats under edit cats. In the current version you can't add own pngs. This is planned for the version 1.5.
Thanks for reporting. It's strange that it does not work. I will try to fix this version of the game.
