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Wordoku: Sudoku with Letters Instead of Numbers

Wordoku is Sudoku with nine letters instead of digits, often from a word that appears once solved. The rules, a puzzle to try, and how to solve it.

Updated 2026-11-06

The rules

Fill the grid so that every row, every column and every 3×3 box holds each of the nine letters exactly once. As in any Sudoku, a good puzzle has exactly one answer. The letters are only symbols: their order in the alphabet means nothing.

A Wordoku to try

This is the second Easy puzzle from our printable sheets, with each digit turned into a letter of the English word FARMHOUSE. The letters were matched so that the word reads across the top row of the answer. It has 51 letters given and exactly one answer.

A Wordoku from our second Easy puzzle: the letters of FARMHOUSE, which reads across the top row once solved.

How to solve it

  • Write the nine letters where you can see them, so you know which ones a row or box is missing.
  • Look for squares with only one letter left, and letters with only one place left in a row, column or box, just as with digits.
  • Some solvers turn the letters back into numbers first; it works because only the pattern matters.
  • The hidden word is a bonus, not a rule: never place a letter just because it would complete the word.
Is Sudoku Math? Logic, Not Arithmetic →16×16 Sudoku: Rules and How to Start →

Practice

Every Find the Mistake puzzle on this site has exactly one wrong digit, and you can play each board right on its page.

Play the puzzles →

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