Ancient Crystals is a short role-playing game with dungeon crawler elements and turn-based combat.

The player controls a group of up to 4 adventurers, who are commissioned by their guild master to reactivate crystals in 5 caves, as they failed because of the last earthquake.

These crystals are needed by the city to generate electricity. However, the caves are inhabited by monsters, so this is a dangerous task that can only be mastered by experienced adventurers.