Play Oni IV - Kijin no Ketsuzoku (Japan) Online

Oni IV - Kijin no Ketsuzoku was a Japan-exclusive release for the original Game Boy, developed by Athena and published by Banpresto. It arrived late in the handheld's life, a time when developers were still finding inventive ways to use the hardware for deeper, more complex adventures.

You control a lone warrior navigating maze-like environments, battling yokai and other supernatural foes with a combination of sword strikes and magical attacks. The goal is to cleanse cursed areas by defeating powerful bosses and restoring balance. Movement is screen by screen, with an emphasis on careful exploration and resource management; you collect scrolls to learn new spells and must often backtrack to access previously locked areas. The pacing is deliberate, and the difficulty can be unforgiving, with limited healing options and aggressive enemies. It feels tense and atmospheric, pulling you into its shadowy world with every cautious step forward.