Okay, so Tsumego on Game Boy is basically digital Go puzzles—those "how do you kill/save this group?" situations that make your brain hurt in the best way. At first glance it looks simple (just black and white stones on a tiny green screen), but five minutes in you're already muttering at the handheld because that obvious-looking move totally backfires when the AI counters.

What I love is how it scales. Early puzzles ease you in, but later ones force you to read like five moves ahead while squinting at that chunky pixel art. The Game Boy's d-pad actually works weirdly well for placing stones, though I still fat-finger the wrong intersection sometimes. Pro tip: the B button lets you undo, which you'll need after realizing your "brilliant" sacrifice was just bad math.

It's the kind of game you play in short bursts, then catch yourself mentally replaying puzzles while waiting for the bus. Still holds up if you're into abstract strategy.