Hi! I’m a Game Boy collector / enthusiast / reviewer. And this question has an easy answer in my opinion…

Catrap

www.youtube.com/watch?v=FfV4MnGfiA4&t=284

• It’s relaxing. It’s a turn based, pure puzzle game. Like, there’s literally no action. The enemies don’t even move!
• It’s big. 100 puzzles that slowly increase in difficulty. I was able to beat them all, over time.
• It’s non-punishing. No time limits. No lives.
• No stress. Catrap was the first(?) game to feature an undo button. Try something out. Didn’t work? Just hold B to undo. You can undo all the way back to the start of the stage, as many time as you want.
• It’s simple. Up, down, left, and right to move. B to undo. I think A is introduced later to swap between characters?
• IT’S FUN. It looks good, plays good, and just feels good to jump around the stage. And completing a stage is so satisfying.

I hope you like it! 🙂