MMIX Playground for Advent of Code 2025

I ve just launched a web-based playground for MMIX, Donald Knuth s RISC architecture from The Art of Computer Programming: https://bolt.bobjansen.net. The source is on GitHub. Almost all of the code by Claude, the idea and bugs or by me. What is it? The playground lets you write, assemble, and run MMIX assembly code directly in your [ ]