It is a 2D bullet hell roguelike game where Error Boy solves situations where games are mixed up due to errors.

Diesuki Dungeon is a roguelike, turn-based strategy game. Recruit bizarre medieval characters, gather equipment to grow stronger, defeat monsters, and head toward the ancient city that holds the “treasure chest containing whatever you desire.”

"Guaranteed high income, simple tasks, and room and board." Trapped in a locked room, your mission is simple: monitor the CCTV cameras hidden throughout the hotel rooms for any "anomalies." Accurately assess and report whether something is a problem for a regular housekeeper, requires public authority, or... requires the intervention of something more profound. Your manual is your only survival guide.