Binary puzzle (Colour contact puzzle)


The binary system is the basis for the following puzzle, designed by C.J. Bouwkamp.

You are given 16 squares. Each square is again divided into 4 squares and represents a binary number from 0 - 15. These squares are either white (0) or green (1) as illustrated below.
You have to arrange the squares into a large 8 x 8 square so that a white square touches a white square and a green square touches a green square.

There are 50 unique solutions to this puzzle. As a special challenge, try to built the puzzle without rotating the squares.

0 = 0000 1 = 0001 2 = 0010 3 = 0011
4 = 0100 5 = 0101 6 = 0110 7 = 0111
8 = 1000 9 = 1001 10 = 1010 11 = 1011
12 = 1100 13 = 1101 14 = 1110 15 = 1111

Problem from:
van Delft, Pieter and Botermans, Jack. 1997. Denkspiele der Welt. Heinrich Hugendubel Verlag, München
 
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