Logic Masters Deutschland e.V.

In each cell of the pyramid, a digit from 1 to 9 is to be entered in such a way that each cell contains the sum or the difference of the two digits below it. In gray colored rows, no digit may be duplicated, and in white colored rows, at least one digit must be duplicated. In the framed areas, the digits entered indicate the sum of all digits in the corresponding cells. No digit may be repeated within an area.