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Doppelblock (Diagonals) (379)
Instruction:
Place either a block or a number from 1 to X (integers only) into each cell so that each number appears exactly once in each row, column, and long diagonal. (X is two fewer than the number of cells in each row.) Each row, column, and long diagonal will therefore have exactly two cells with blocks in them. The numbers outside the grid indicate the sum of the numbers between the two blocks. Some cells may already be filled in for you.