Microcosm (here's an ad) is a puzzle book by Hal Gashtan. There's a subreddit with more information.
Select a page:
Thanks to N. Mynheer for allowing me to include the illustrations.
Messages: 1k 1p 2 3 4 5 6 7k 7p 8 9 10 11k 11p 12 13
Keys: 1 2 3 4 5
Thanks to mondriansdog for the solution.
Microcosm (21k; Win32 & DOS binaries, C source). This is a C conversion of the Basic program, with all the page text built-in.
Windows GUI version (11k; includes C source). Uses drop-down lists to select lines and key (won't work with the keyring).
text.h required by all the sources.
State (2k) files for ucosm (run with a file as argument) or microcosm (exit, copy a file to state.txt, restart).
27 August, 2022.