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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 [7], written by John Tantalo.
On Android, please touch for left click and long press for right click. Also note that where this manual refers to pressing a letter on the keyboard, the Android version has icons at the bottom of the screen instead (Control and Shift are not available). There is also an optional "Night mode" which uses darker colours in low light.
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.)
There is only one parameter available from the ‘Custom...’ option on the ‘Type’ menu: