Do you want to experiment with writing and distributing custom challenges without making a mod each time?
With this mod you can simply write lua files to generate the challenge without having to worry about how to inject it. You can also disable/reenable this mod to reload the challenges, meaning you can make changes and quickly iterate.
Sharing challenges is much easier too, simply send a single lua file and direct them to place it in challenges/ next to their mods and apis folder.
See the challenge_loader/challenges/ directory for some examples
https://github.com/MasonGulu/balatro_challenge_loader
Will be in the balamod "store" soon.