Slide the hearth stone along the bottom of the cavern. Tap to send a glowing orb upward so it rebounds off the walls and crystal clusters. The last slide leans the launch. Each hit chips a crystal; some clusters take more than one hit to shatter.
Clear every crystal to finish the stage. If an orb falls past the stone, you lose a life. When no lives remain, the round ends. Consecutive hits raise a combo and add more points.
Shattered crystals may drop motes. Catch them for an extra orb, a wider stone, a slower tide, a piercing streak, a pull that draws motes toward the stone, or a hotter strike that chips two layers.
Slide the hearth, bounce the orb into crystal clusters, and clear the rack.