Karst is a 3D first-person puzzle game set in a cave. The premise: you fell in, and you need to find a way out. The mechanic: this cave is home to a series of unusual crystals, each of which seems to have its own unique effect. If you’re clever, you can use these crystals to progress through the caves – if you’re not, you’d best get used to not eating.
This is a crystal being dropped down a vertical shaft, showing both how the light works from the crystals, as well as giving an idea of how we are able to generate our caves.