Required: Cloth Config, Magicalbananapi's 1.21.1 Gravity Changer fork
Optional: Mod Menu (but recommended for accessing mod config)
this is a fabric mod that only works on 1.21.1. it assigns different gravity directions to each chunk when your world generates using the gravity changer api mod, making for an interesting minecraft challenge.
you can enable/disable this "gravity grid" with the custom gravityGridEnabled gamerule, and you can also configure a hud element that shows the gravity direction on your screen in the mod config settings.
if you'd like to use assets/modified versions of this mod in your own projects and publicly share them, credit me and link this page or my YouTube video.