Castelian on GB is one of those classic Game Boy puzzlers that looks simple at first—just stack blocks to climb towers—but gets brutal fast. The first few levels ease you in, but then the enemies start swarming, platforms crumble under you, and suddenly you're sweating over every move. That moment when you misplace a block and your whole tower collapses? Pure pain.

The retro graphics hold up surprisingly well, with chunky, colorful sprites that give it that early '90s charm. And the music? Exactly the kind of bleepy, repetitive track that gets stuck in your head for days. I kept going back just to beat my high score, even when the later levels felt impossible. If you dig old-school puzzle games with teeth, this one’s a solid time capsule.