The Witcher 3: Wild Hunt’s official modding tool, REDkit, will be available May 21, developer CD Projekt Red has announced. It will be a free download for those who own The Witcher 3 on PC.

As CD Projekt Red explains in the tool’s description on Steam, users will have the ability to edit almost anything within the developer’s critically acclaimed open-world RPG. They’ll also be able to make entirely new additions like new quests, items, environments, and characters, complete with new animations and storylines.

“The Witcher 3 REDkit is more than just a game development tool–it’s a love letter to our community!” CD Projekt RED states on the tool’s Steam page. “With The Witcher 3 REDkit, you can share your ideas, and inspire others to create a unique gaming experience that is truly your own. We can’t wait to see the amazing things you’ll do with it, so let’s come together and make The Witcher 3: Wild Hunt even more exciting and enjoyable for everyone.”

The tool uses many of the same tools that CD Projekt Red did to make the full game, though the developer does note that for those wishing to make a full-fledged game using REDkit, “achieving the full scope of development akin to the original creators may require access to external tools.” The tool, and the ability to install Witcher 3 mods, is currently only available for those who own the game on PC.

Mods have existed for The Witcher 3 long before the arrival of REDkit, though they should become even more prominent come its release. CD Projekt RED even reached out to mod creators and used some of their work for the game’s 2022 next-gen update for Xbox Series X|S, PlayStation 5, and PC.

REDkit will hopefully help keep Witcher fans occupied while CD Projekt Red works on the next official installment in the series, which will use Unreal Engine 5 and will kick off a new trilogy of games. Last year, The Witcher 3 crossed 50 million copies sold, becoming one of the best-selling video games of all time.