I have been building a challenges mod for minecraft 26.x and the idea is pretty simple. You type /challenges, a menu opens, you pick a challenge and it changes the gameplay. First challenge I am working on is shared life, where damage shared with every player.
Getting it running was honestly kind of a pain. 26.x doesnt need yarn mappings anymore since mojang ships unobfuscated now. Which sounds great until you realize nearly every of the classes isnt the same as yarn mappings and nothing matches the (now outdated) tutorials. For example: hurt() is now hurtServer(), GuiGraphics is GuiGraphicsExtractor.
I used AI to help look stuff up which sped things up a lot but even that was not always right.
I am finished with the Menu and I started with the challenge code.