Solitomb

Solitomb is a unique blend of solitaire and dungeon-crawler genres. As an adventurer who made a pact with a demon, your task is to clear a monster-infested dungeon to release the demon from its seal. Use your solitaire skills to assemble powerful combos, defeat dungeon monsters, and manage the demon's patience to survive. The game is currently available for free, but you can pay what you want to support the development of the expanded edition.