Detective Grimoire is a mystery adventure game developed by Armor Games that takes place in a small tourist attraction in the heart of the marshes. The game begins with the murder of the owner of the tourist attraction, and Detective Grimoire is called to investigate. The murder seems to have been committed by a mythical creature that the tourist attraction is based around. The player must explore the surrounding area, inspect the scene of the crime, grill the suspects, solve puzzles, search for clues, and uncover the secret of the swamp!

The game features a mixture of investigating and puzzle gameplay, designed with mouse/touch in mind. Assemble Grimoire's thoughts to reach conclusions about the case. The game also has a fully voiced and animated cast of characters to interrogate, beautiful digitally painted environments to explore, and an award-nominated original orchestral soundtrack.