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- Pearl
- <p>
- Draw a single closed loop by connecting together the centres of
- adjacent grid squares, so that some squares end up as corners, some as
- straights (horizontal or vertical), and some may be empty. Every
- square containing a black circle must be a corner not connected
- directly to another corner; every square containing a white circle
- must be a straight which is connected to <em>at least one</em> corner.
- <p>
- Drag between squares to draw or undraw pieces of the loop.
- Alternatively, left-click the edge between two squares to turn it on
- or off. Right-click an edge to mark it with a cross indicating that
- you are sure the loop does not go through it.
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