Rules
Read the letter Sudoku rule set in plain English.
RulesWordoku
Wordoku
Wordoku is Sudoku with letters instead of numbers. The live board keeps the familiar 9x9 logic but shows nine clear uppercase letters for a calmer word-style puzzle.
Wordoku variant profile
- Rule change
- Use each letter once in every row, column, and 3x3 box.
- Current letters
- Each live puzzle uses one curated set of nine different uppercase letters.
- Senior fit
- Large uppercase letters can feel friendlier than a dense page of digits for some players.
- Playable state
- Wordoku is available from the main board with its own mode button.
Why Wordoku fits this site
Traditional Sudoku has strong rules but little theme. Wordoku keeps the same solving engine and adds a light word-oriented layer by replacing 1 through 9 with letters.
For older adults, this works only if the letters stay large, high contrast, and easy to tell apart. That is why the live mode uses curated nine-letter sets rather than small decorative symbols.
How to start
Choose Wordoku 9x9 from the board size controls, then tap a square and choose a letter from the large pad.
Number keys still work for players who prefer a keyboard, and the matching letter keys work too when the selected letter is in the Wordoku set.
- Use Easy for a first letter Sudoku.
- Use Undo freely after an accidental tap.
- Print a large sheet if paper solving is more comfortable.
Wordoku Paths
For seniors
Why letter Sudoku can help when the board remains large and uncluttered.
Senior GuidePrintable Wordoku
Open a clean letter Sudoku sheet with a separate answer grid.
PrintableLetter Sudoku
The common search phrase for Wordoku-style puzzles.
Letter SudokuPractical Questions
Is Wordoku the same as Sudoku?
The solving rules are the same as classic 9x9 Sudoku. Wordoku uses letters instead of the numbers 1 through 9.
Can I play Wordoku here now?
Yes. Use the Wordoku 9x9 mode on the main board, or open the Easy Wordoku button on this page.