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This calculator requires the use of Javascript enabled and capable browsers. This is a thinking game. Your objective is to check all of the boxes. Each box you check or uncheck by clicking on it will set each of the surrounding boxes in the North, South, East and West positions to the opposite state that they have at present. There are 5 levels of difficulty. Enjoy.

CheckOut Game Board

Difficulty Level 1
Difficulty Level 2
Difficulty Level 3
Difficulty Level 4
Difficulty Level 5

Version 1.4.1

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