Sudoku

Fill the 9×9 grid so every row, column and 3×3 box contains 1–9 exactly once. Use the given digits to deduce the rest — no guessing required. Trains constraint logic.

Trains: Constraint logic · Category: Logic & Puzzles

How to play: Sudoku is a free, browser-based brain-training game in the Brain Gym suite. Play it instantly — no sign-up, works offline, and your best scores are saved on your device.

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