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- Map
- <p>
- Colour the map with four colours, so that no two adjacent regions
- have the same colour. (Regions touching at only one corner do not
- count as adjacent.) There is a unique colouring consistent with the
- coloured regions you are already given.
- <p>
- Drag from a coloured region to a blank one to colour the latter the
- same colour as the former. Drag from outside the grid into a region
- to erase its colour. (You cannot change the colours of the regions
- you are given at the start of the game.)
- <p>
- Right-drag from a coloured region to a blank one to add dots marking
- the latter region as <em>possibly</em> the same colour as the
- former, or to remove those dots again.
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