A Solitaire Mystery is a collection of over 20 mysterious solitaires. The solitaires included vary from fairly standard cardgames to funky reimplementations of other games in solitaire form.
Buy it here (USD $3): https://hempuli.itch.io/a-solitaire-m...
Soundtrack by Hazelstorm: https://hazelstorm.bandcamp.com/
For full credits see the Itch.io description or the in-game credits section!