How to Play Word Sudoku
Master the rules of Word Sudoku with our clear guide and worked example
The Core Rules
Word Sudoku follows the same logic as classic Sudoku, but instead of numbers 1-9, you use the letters of a single word. Every row, column, and block must contain each letter exactly once.
One Word Per Puzzle
Each puzzle uses exactly one word. If the word is "PLAY", you'll only use the letters P, L, A, and Y throughout the entire grid.
Rows Must Be Complete
Every horizontal row must contain each letter from the word exactly once. No repeats, no missing letters.
Columns Must Be Complete
Every vertical column must also contain each letter from the word exactly once. Same rule, different direction.
Blocks Must Be Complete
The grid is divided into blocks (like 2x2 squares in a 4x4 grid). Each block must contain each letter exactly once too.
Worked Example: 4×4 with "PLAY"
Watch step-by-step how to solve a 4×4 Word Sudoku puzzle using the word "PLAY". Click Play to auto-solve, or use the arrow buttons to step through manually.
Animated example: solving a 4 by 4 Word Sudoku puzzle for the word PLAY
Interactive practice: tap the highlighted cell, then tap the correct letter from the tray
Common Beginner Mistakes
Even seasoned Sudoku players can stumble when switching to letters. Watch out for these pitfalls:
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Forgetting the word constraint
In classic Sudoku, any digit 1-9 can go anywhere as long as row/column/block rules are met. In Word Sudoku, you're strictly limited to the letters of one word. You can't introduce new letters.
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Missing letters in blocks
It's easy to focus on rows and columns and forget that blocks also need every letter. A row might look complete, but if its block is missing a letter, the puzzle isn't solved.
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Guessing instead of reasoning
When you're stuck, it's tempting to pencil in a letter and hope. But Word Sudoku puzzles are designed to be solved through logic alone. If you're guessing, look for a row/column/block you haven't fully analyzed.
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Not using the mistake limit wisely
The app allows 3 mistakes before resetting. Use them strategically to test your reasoning when you're 90% confident, not as random guesses.
Ready to Play?
Try your first Word Sudoku puzzle now—free on Android with four game modes
Download on Google Play