As seen in "Can I Beat Minecraft WITHOUT Touching RED?"(https://youtu.be/4w1kTuf9TkA)
The Can't Touch Red challenge is part of the "6T4 Challenges" Mod

Instructions:
Unzip and install the jar how you would install any other fabric mod and then enable challenges in the "6T4" menu from the title screen or the pause menu.

Notes:
- Tested on Minecraft 1.21
- Requires Fabric 0.16.10

Changelog: 1.1 (post video update)
- added more blocks/items/mobs that should be added to the Can't Touch Red Challenge
- added more blocks/items/mobs that should be added to the Can't Touch Green Challenge
- removed a challenge I wasn't ready to enable yet lol