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Spot the cell where only one digit fits.

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About this page & FAQ

About PlayMemorize Sudoku Force

PlayMemorize Sudoku Force is a free forced-move Sudoku trainer. Every round shows a nearly-complete 9×9 grid with one cell highlighted. Exactly one digit (1-9) fits that cell given the row, column and 3×3 box constraints · pick it and your streak grows.

Cheat-proof validation. A pure verifyForcedNumber function checks that your chosen digit is the unique legal value for the target cell. Any other digit either repeats a row/column/box entry or leaves the cell's constraint set with more than one candidate.

Short, focused rounds. Instead of solving a whole Sudoku in twenty minutes, you solve one forced move in five seconds. Train the core Sudoku skill · "only one digit goes here" · hundreds of times a session.

Part of the PlayMemorize family of free brain-training games. Runs entirely in your browser, works offline as a Progressive Web App.

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Q: What is Sudoku Force?

A free forced-move Sudoku game. Each round shows a nearly-complete 9×9 grid with one cell highlighted. Exactly one digit fits the highlighted cell given the row, column and 3×3 box constraints. Pick the right digit to build a streak; miss once and the run ends.

Q: How is the answer validated?

A pure function called verifyForcedNumber checks that your chosen digit is the unique legal value at the target cell. It scans the row, the column and the 3×3 box for every digit 1-9 and confirms only one survives.

Q: Do I need to solve the whole board?

No. The whole point of Sudoku Force is to train the single "forced move" skill in isolation. You never have to solve a full Sudoku; you just spot the next forced digit, over and over.

Q: Is it free?

Yes, completely free. No account, no ads, no paywalls. Your high streak is stored locally in your browser.