The Colorit Puzzle

You are given a board covered with polysquares, each painted in one of eight colors.
Your task is to recolor these polysquares (using only the four colors red, blue, green, and yellow) such that no two adjacent polysquares carry the same color.


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It is well known (by the four-color theorem) that any two-dimensional map can be colored with four colors.
In this game, however, adjacent polysquares are not allowed to have the same color AT ANY TIME during the coloring.
This makes the task more demanding, sometimes so much so that you cannot complete the task if you colored some pieces with the wrong colors earlier on.
Select one of the four colors—red, blue, green, or yellow—at the "paint" setter bar.
Then click the board. The clicked polysquare will change color.
Winning and Losing
You win when all polysquares are painted either red, blue, green, or yellow. In this case a "YOU WIN" message will appear on the left margin.
You lose if your moves caused two adjacent polysquares to have the same color. In this case a "YOU LOST" message will appear on the left margin, and the border between the two adjacent polysquares of same color will turn white. No further coloring will be allowed.
You can always take the last step back by clicking the "take back" button.
From the "challenge" drop-down menu you can select several board sizes:
10×10, 15×15, 20×20, and 25×25.
This game was first published by the same author as the Zillions game "Colorit", which runs much faster.
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Related Curriculum Standards

US Common Core State Standards, Mathematics