Historical note: I wrote this in 1998 (when I was 16), so I'm just putting it up here as a backup and for "historical interest". It's still a pretty good show-case for how simple a self-hosting Forth ...

For the 2025 Advent of Code I decided to solve the puzzles in Forth. I learnt Forth back in 1983 or so to program 8 bit computers (my ZX81 with an alternate ROM) and used it for a few years, so I ...