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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 , written by John Tantalo.
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.)
There is only one parameter available from the ‘Custom...’ option on the ‘Type’ menu: