SUGURU
Each cell in an outlined block must contain a digit: a two-cell block contains the digits 1 and 2, a three-cell block contains the digits 1, 2 and 3; and so on. The same digit must not appear in neighbouring cells, not even diagonally.
Each cell in an outlined block must contain a digit: a two-cell block contains the digits 1 and 2, a three-cell block contains the digits 1, 2 and 3; and so on. The same digit must not appear in neighbouring cells, not even diagonally.