A customizable puzzle with a board. You can adjust the size of the stones and assign a seed to the heightmap randomizer. Make sure that each stone is quite different from the others. If it is to hard to solve you can just use 3 x 3 or even 2 x 2 stones. In the stl files the stone size is 20mm and the seed is 1. You can leave a comment when you find an interesting seed if you like.