KaKuRo (also known as Kakro or Cross Sum) is a challenging logical puzzle that is becoming the new SuDoKu. Wikipedia

Rules:

• Place a single number from 1 to 9 in each empty cell.
• The sum of each vertical or horizontal blocks should equals the number at the top or on the left of that block (known as hints). For example if block sum is 3 and the block contains two empty cells the options are 1,2 or 2,1
• Numbers may only be used once in each block.

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