Arrange the dominoes in seven squares. The number of dots along each side of the square must be equal to the number in the middle. Double click the dominoes (or use the rotate button) to rotate them then drag them into place.
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"This puzzle is traditionally posed as a challenge to create seven square frames with all 28 dominoes so that the sums of the numbers of dots are the same at all four sides. Transum has simplified the problem slightly by showing what the totals are for the seven square frames. Are there any other solutions to the traditional problem which produce different side totals? Please let us know! Transum,
"Very good." Gharbi, Tunisia
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References: Mathematische Basteleien