This is a tiny but very interesting and fun puzzle. The goal is to free the key and the amount of puzzling built into this small form factor is amazing!
This copy was solved once and has minimal patina.
Stored in smoke-free humidity controlled environment.
Can combine with other puzzles of mine which are listed.
Payment
via PayPal or Wise. PayPal has a lot of fees (FnF not possible), so
Wise is preferred, but not mandatory, and I can offer 5% discount if
using Wise.