Kaisen Game - Navy Blue is one of those obscure Game Boy titles that flew under the radar outside Japan. It's a naval strategy game where you command ships in turn-based battles—think Battleship but with way more depth. The pixel-art waves and chunky little sprites give it that classic early '90s charm.

First few minutes, you're thrown into picking your fleet (destroyers, subs, carriers) and figuring out how to position them. The controls take some getting used to—typical Game Boy menu diving—but once it clicks, there's something satisfying about outmaneuvering the AI's attacks. Pro tip: don't underestimate torpedo boats early on.

It's definitely niche, but if you're into retro war games or just love digging up forgotten Game Boy oddities, this one's a neat time capsule. The manual's all in Japanese, though, so expect some trial and error.