The Scott Adams adventure game series was published around 1978-83, and started on the TRS-80 Model I. I don't know if there were ever official CP/M ports, but they were certainly of that era.
Thanks for the clarification! I hacked TRS-80 Model I hardware (for a friend), but I never cared much for TRSDOS or Lifeboat so I have missed out on that software experience.
I guess this was a port of the classic Adventure game to Tandy. I had the CP/M version (550 point Colossal Cave Adventure). I had played it even earlier on RT-11 where it took about half an hour to load from two 8" floppies.
...but like HHGttG it targets the Z-Machine, and third-party interpreters for Z-Machine files have been written for probably every platform under the sun. It's also possible that executables from HHGttG can be repurposed. This post seems to support the latter approach: https://retrocosm.net/2011/01/03/z-machine-interpreter-for-c...
Both games are maddeningly hard, btw. I don't think I finished either of them.
... and you can't really finish them without access to the original material - some game puzzles can only be solved using accessories available in the box. A gentle kind of copy-restriction, that didn't stop you from making backups.
Actually, it's the BBC controlling us from London.
