Planarity is a simple game, but difficult to master. You're given an arrangement of dots in a circle. Each dot is connected to 2, 3 or 4 other dots via lines, and as you move the dots, the lines stay attached to the dots. The object is to arrange the dots so that none of the lines cross. Try it for yourself to see how challenging this can be.
Once you've tried it for yourself, play the video above, in which TimwiTerby not only solves a level 18 puzzle, but does so by arranging them in perfect rows!
If that isn't impressive enough, check out the level 19 video, in which the final arrangement is a series of concentric circles!