Double Dungeons is a solo dungeon crawler where one or two players explore pseudo-3D, maze-like dungeons. The player can choose to venture into any of the available 20 dungeons, each with varying layouts and increasingly difficult enemies. Two-player mode features a split screen, allowing two players to start exploring from different points.
The gameplay is simple: enemies appear at specific points, must be defeated to proceed, and combat follows a turn-based system with quick turns and enemy attacks even when the player doesn't act. Attacking is done by pressing a button, with no other combat options. Players can find equipment and healing items to restore HP outside of battles, and level up automatically.
There is no narrative in Double Dungeons ; story-related information is provided through short text intros to each dungeon, outlining the mission objectives.