I've just played Puyo Puyo Solitaire a few days ago, and it's honestly reminding me why Solitaire can be such a fun time sink, while also having genuinely fun and interesting Puyo modes. There's a whole side mode with tens of missions about sorting and clearing out Puyos from your board, and some of the missions in it are kind of tricky.
It's a very game with very minimal content, sure, but the game is fun and is easily making me want to play it again and again. It's way more fun than what Microsoft put out in recent years with their Solitaire version. If this silly game had a release on GOG, I'd buy it.