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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.

(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.