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Color the map with four colors, so that no two regions sharing a border have the same colour. (Regions touching only in corners do not count as adjacent.) There is a unique coloring consistent with the colored regions you are already given.

Drag from a colored region to a blank one to color the latter the same color as the former. Drag from outside the grid into a region to erase its color. (You cannot change the colors of the regions you are given at the start of the game.)

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

Courtesy of Simon Tatham's Puzzle Collection via the MIT license.

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