Map

from Simon Tatham's Portable Puzzle Collection

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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.

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.)

Right-drag from a coloured region to a blank one to add dots marking the latter region as possibly the same colour as the former, or to remove those dots again.

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