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Irregular Doppelblock (26)
Instruction:
Blacken or place a number from 1 to X into each cell so that each row and column has exactly two blackened cells and one of each number. (X is two less than the number of cells in each row.) The numbers on the left and top of the grid represent the sum of all the numbers between the two blackened cells in that respective row or column (if there are no numbers between the blackened cells, the sum is 0). A row or column without a number outside the grid may have any sum.
Some cells have shapes that span more than one row or column.