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Chapter 18: Untangle

You are given a number of points, some of which have lines drawn between them. You can move the points about arbitrarily; your aim is to position the points so that no line crosses another.

I originally saw this in the form of a Flash game called Planarity [7], written by John Tantalo.

[7] http://planarity.net

18.1 Untangle controls

To move a point, click on it with the left mouse button and drag it into a new position.

The cursor keys may also be used to navigate amongst the points. Pressing the Enter key will toggle dragging the currently-highlighted point. Pressing Tab or Space will cycle through all the points.

(All the actions described in section 2.1 are also available.)

18.2 Untangle parameters

There is only one parameter available from the ‘Custom...’ option on the ‘Type’ menu:

Number of points

Controls the size of the puzzle, by specifying the number of points in the generated graph.