Sudoku

Sudoku is a logic-based, combinatorial number-placement puzzle. In classic Sudoku, the objective is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 subgrids that compose the grid contains all of the digits from 1 to 9. The puzzle setter provides a partially completed grid, which, for a well-posed puzzle, has a single solution.

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Source: Wikipedia · Image: Wikimedia Commons · CC0

WORDTURN

Turn words over — anagram and pangram checkers, Scrabble scoring, syllable and readability tools, and the wordplay reference every writer and puzzler needs.

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