Original code and idea by Mikael Brännström
Re-edited for online use and additional code by Fredrik Wicksell
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INSTRUCTIONS HOW TO PLAY:

When you press play, the left board will be generated with colors in it.
The goal of the game is to make the right board look exactly like the left one as fast as possible.

A square can only be clicked once. Every time you click an empty square it will become red. To change color on a clicked square you do a number of neighbourhood square clicks (the squares on the left/right/top/bottom side of the square in mind) depending on what color you aim for. See the chart below how many neighbour clicks a certain color need.
As you only have one click on each square you therefore have to plan a bit ahead how to make all squares reach their final color when you click the last empty square (or neighbour square).

Chart for neighbourhood clicks needed to reach a final color:

  0 or 4 clicks   1 click   2 clicks   3 clicks


Some tips on how to get started:

As a yellow square needs 3 neighbour clicks it's safe to click on the place for that square when it's positioned on the edges (of the board or beside a clicked square).

As a blue square needs 2 neighbour clicks it's safe to click on the place for that square when it's positioned in a corner (of the board or between two clicked squares).

When two or more red squares are grouped together, at least one of them has to be a "4 clicker". If one of them is positioned next to a clicked square (or edge), a square in the closest neighbourhood direction has to be a "4 clicker". Keep in mind that a "4 clicker" can occur even without a red neighbour.

If you start with these tips, new places will show up where you can continue with the rules and so on.

Watch me in this short movie complete a size 4 board just by following these tips above: Demoplay (150 kb avi)


Training

Press this button during a game to start all over with the same generated board. This is a good way to practice how the game works.
But do remember that you will not be able to enter the highscore list once you entered training mode for the board in mind.


Undo

As any misclicked square will ruin the whole game (it's impossible to make it right later), one level of undo is quite fair when you're in a hurry and the squares in the bigger boards are small. This will not affect your chance to get into the highscore list.

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