Wordoku Online
Classic sudoku played with letters A–I instead of digits — same logic, distinctly different look. Pick a tier and start solving.
Wordoku is classic 9×9 sudoku played with the letters A through I instead of the digits 1 through 9. The rules are unchanged — each row, column, and 3×3 box must contain every letter exactly once — but the visual swap rewires how your brain scans the grid. Solvers who rely on subconscious digit recognition suddenly have to read every cell, which slows pattern matching and makes familiar technique feel fresh. Every Wordoku puzzle on Sudoku247Online is freshly generated and guaranteed uniquely solvable by pure logic; the keyboard accepts A–I (case-insensitive) and 1–9 interchangeably so you can switch input style mid-solve. Use the same naked singles, hidden singles, pointing pairs, and X-Wing patterns you know from classic — they all work, you just spot them through letters.
New to this variant? Read the Wordoku rules on Sudoku247Wiki — illustrated and beginner-friendly.