Untangle

About Untangle

Untangle is a relaxing graph puzzle, also known as Planarity: a tangle of dots joined by crossing lines, and your job is to pull it apart. Drag the dots anywhere on the board until no two lines cross. The connections never change, only the positions of the dots, so every puzzle can be laid out flat; the trick is finding how. Small puzzles with 6 or 10 points take a minute, while 20 or 25 points make a satisfying brain teaser. It works well with a finger on a phone or a mouse on desktop, and there are no timers or penalties, so you can take it at your own pace. Undo any move, restart the layout, and your current puzzle is saved on this device for next time.

Game by Simon Tatham, used under the MIT license.

How to play

Drag a dot to move it; its lines follow. The puzzle is solved when no lines cross. Keyboard: arrows select a dot, Enter picks it up and drops it, Space cycles dots.