May 12, 2015

Puzzle 083 - Tousa

Tousa was invented by Naoki Inaba.

Rules for Tousa
Write a number between 1 and 9 in exactly three cells of each row and column of the diagram. The numbers in a row or column must form an ascending arithmetic sequence from left to right resp. top to bottom (i.e. the difference between two consecutive numbers must be constant; e.g. 1-2-3 or 2-5-8 or 3-5-7).

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