Play Ganbare Goemon - Tengutou No Gyakushuu (japan) Online

Ganbare Goemon: Tengutou no Gyakushuu came out for the Game Boy Color in 2000, developed by Konami. It was part of that late handheld era where developers were really starting to push what the hardware could do visually. This was a Japan only release, so it remained a bit of an obscurity for many players outside the region.

You control Goemon, the blue haired hero, navigating through side scrolling stages and top down villages. Your main goal is to fight through levels, defeat bosses, and rescue your friends from the tengu villains. You use your pipe to attack enemies directly, and you can also collect coins to buy items from shops or find power ups that change your attack. The game mixes action platforming with light exploration, and the pacing is generally brisk, though some later stages can be tricky. It feels like a compact, energetic adventure that fits right in your pocket.