Play Undercover Cops Gaiden - Hakaishin Garumaa (Japan) Online

I remember picking up Undercover Cops Gaiden on the Game Boy back in the day. It was a Japan-only release from Irem, the same folks behind the arcade original. On a system filled with platformers and RPGs, this side-scrolling beat 'em up stood out for its gritty style and commitment to the genre's core appeal, even on the small screen.

You control one of three vigilante cops, each with unique moves, and fight through urban stages packed with enemies. The main goal is straightforward: punch, kick, and use special attacks to clear each area of criminals. Signature mechanics include picking up weapons like pipes or knives dropped by foes, and executing screen-clearing super moves at the cost of some health. The pacing is aggressive, with enemies swarming constantly, and the difficulty can feel punishing if you aren't careful with positioning. It feels raw and immediate, like a condensed arcade scrap in your hands.