I play a lot of windowed games on my PC as I watch less engaging content like TV I’ve seen, Youtube. Lately Balatro, Peglin, a racing game called art of rally, Mini Motorways. Interested to hear other people’s preferences.
I generally want something that runs well windowed because I use a third of my ultrawide to run the video, so no shooters or “big” games usually.
Riichi Mahjong (Mahjong Soul, Riichi City), Slay the Spire, and Panel de Pon are my main second monitor fare these days.
Ooh - Panel de Pon reminds me of Puyo Puyo Tetris which I have ~200 hours in on Steam.