How to Solve Wordoku: Rules, Tips and Strategies for Beginners
Wordoku is sudoku with letters. Instead of filling a grid with numbers 1 to 9, you fill every row, column and box so that each one contains every letter exactly once. The twist: the letters come from a theme — an Animals wordoku might use A, C, D, E, G, L, M, O and T — which makes the puzzle feel friendlier than numbers for many solvers. If you can solve a sudoku, you can solve a wordoku; here's how it works and how to get good at it.
The rules in one minute
Every row must contain each of the puzzle's letters exactly once. Every column must too. And every box (the 2×2, 2×3 or 3×3 blocks depending on the grid size) must contain each letter exactly once. Some letters are given as clues; your job is to fill the blanks. Every wordoku puzzle has exactly one solution.
How to read the grid
Wordoku uses the same grid shapes as sudoku — 4×4, 6×6 or 9×9 on our generator — with letters instead of numbers. The letters in play are shown above every grid, which is your answer key: a 4×4 wordoku uses exactly four different letters, a 9×9 uses nine. On our wordoku generator the theme decides the letter set, and you can type letters straight into the squares with instant checking. Start with 4×4 or 6×6 if you're new to the rules.
1. Scan every row, column and box
The core sudoku technique applies unchanged. Look at a row: if it already contains seven of the nine letters, the two blanks must be the two missing ones — and their columns or boxes usually decide the order. Sweep the grid for nearly-complete lines first; each letter you place tightens everything that crosses it.
2. Use the missing-letter trick
In a 4×4 wordoku with letters A, B, C, D, a row that shows A, ?, C, ? must hold B and D in its blanks. The same goes for columns and boxes. When a box's missing letters are known, check each blank's row and column to see which of the missing letters it can still take — the one that fits only one cell is forced.
3. Let the boxes do the heavy lifting
Each letter appears exactly once per box, so a letter already placed in a box rules out every other cell of that box. If the letter M sits in the top-left box, no other cell in that box can hold M — which means M's remaining positions are all in the other boxes, and their rows and columns narrow it down further. Box logic plus line logic solves most wordokus without any guessing.
4. Pencil in the candidates
In the corner of each blank, jot the letters its row, column and box still allow. Short candidate lists turn the puzzle into a pure elimination chart. When two cells in a line can only hold the same two letters, those letters are locked into those cells — no other cell in the line can use them. That's the classic "pair" move, and it's the most powerful step beyond plain scanning.
5. Avoid the classic mistakes
Three errors trip up beginners. First, forgetting the letter set — a 6×6 wordoku uses exactly six letters, and a letter outside the set is always wrong. Second, checking rows and columns but forgetting boxes; the box rule is what makes the puzzle solvable. Third, guessing when a careful scan would do — always exhaust the given letters before you commit. And if you're stuck, the answer key shows exactly how the letters were meant to fall.
Practice with a printable wordoku
Wordoku improves fast with practice, and a fresh puzzle is one click away on the wordoku generator — pick a theme, grid size and difficulty, then print up to 8 puzzles per sheet or solve on screen with instant checking. Start on a 4×4 easy, where the letter set is tiny, and work up to 9×9 hard as the givens thin out. If you enjoy the logic, our sudoku guide covers the same moves with numbers — and if you like the themed words, word searches are a fun change of pace.