The Tartarus Key is a puzzle-driven horror adventure that traps its protagonist inside a strange, locked mansion. Exploration and item-based puzzles form the core of play as the player searches for a way out while piecing together the mansion's unsettling history.

Tension builds gradually through atmosphere and mystery rather than constant danger, with branching choices shaping how the story unfolds. It's a fit for players who enjoy classic escape-room style puzzles wrapped in a moody, narrative-driven setting.