Sid Sackson's Bowling Solitaire webapp version
As a learning exercise I've put up Bowling Solitaire which I found in Sid Sackson's A Gamut of Games which was published in the sixties.
It started out with me trying to figure out how to do "mobile first" games where you can push images around with your finger, and I ended up having to device my own hack for this since all the stuff Google brought up was kinda legacy.
This is now about the sixth solitaire game I've done, gradually refining my own framework which uses no third-party libraries, just plain-vanilla JavaScript, CSS and HTML.
Anyways, I've been finding this very fun and educational, and find my own homebrew UI fairly intuitive, but would be nice to hear if other people find the game easy to learn and play. My full (and growing) list of games is on the homepage.