Shade two cells in each row and column. Place numbers 1 to N-2 (where N is the grid size) in each unshaded cell so that no number is repeated in a row or column. The numbers outside the grid give the sum of the numbers between the blocks in that row or column. In Irregular Doppelblock, some cells may span more than one row or column; if you shade them they count as shaded for all the rows and columns they are in, and if not shaded, they count as a single cell in each row and column. In Doppelblock Sudoku, each heavily outlined region also has two shaded cells and one of each digit.
Puzzles
MIT Mystery Hunt 2025 This is Just a Test
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