Happy 30th installment of the Daily Sudoku League! Today, we are defending the grid with Fortress Sudoku. The classic rules of placing 1 through 9 in every row, column, and 3x3 block apply, but you must pay close attention to the shaded fortress regions. The key rule is that any digit inside a fortress must be strictly greater than at least one orthogonally adjacent digit outside the walls. This creates a fascinating "high ground" strategy. Can you build the perfect logical defense and conquer this puzzle?
Fortress Sudoku Rules
Classic Sudoku Rules apply. Additionally, a digit in a shaded cell must be higher than the digits in all orthogonally adjacent white cells.
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| Fortress Sudoku (Daily Sudoku League #30) |
Previous Daily Sudoku League Puzzle: Magic Square Sudoku
Next Daily Sudoku League Puzzle: Odd Sudoku
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