Sudoku Unlimited – Free & Clean Number Logic Grids | Infinite Puzzles
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How to play Sudoku
No Repeats
Fill the grid so that every row, column, and primary block contains all digits exactly once.
Grid Sizing
Easy puzzles use a 6x6 grid with 2x3 mini-blocks. Medium and Hard puzzles use the classic 9x9 grid with 3x3 blocks.
Interactive Board
Select a cell and type the number on your keyboard, or click the numbers on the screen to fill out the grid!
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Frequently Asked Questions about Sudoku
Common player questions, solvability guarantees, and deduction tips.
1Are all Sudoku puzzles guaranteed to have a unique logical solution?
Yes! Every Sudoku grid is mathematically verified to have exactly one valid solution that can be reached purely through logic without any guessing.
2How does the step-by-step hint system work in Sudoku?
Our hint engine identifies real solving techniques (naked singles, hidden pairs, pointing candidates) and guides you through the exact deduction so you can master harder puzzles.
3Can I play Sudoku online for free without ads?
Yes! Infinite Puzzles provides completely free, unlimited Sudoku puzzles across 6×6 (Easy) and 9×9 (Medium & Hard) grids with zero ads.