Sudoku Guides — Learn and Practice

Choose Sudoku guides by the question you have

These Sudoku guides move from the three constraints to complete notes, then compare singles and explain candidate eliminations. If you already understand the rules, choose the place where your reasoning stops rather than rereading everything. Each solving article includes verified examples, counterexamples and explained exercises.

Practice without losing your board

The diagrams and exercises live separately from the full game. Trying an exercise or viewing its answer does not replace your current puzzle. Return to the same browser to continue, or choose a difficulty page to practice with a new board. Print and daily instructions explain product tasks as well as deductions.

Learn one move. Find the next.

Each guide tackles a specific problem with an original grid, a reason for the move, a counterexample and exercises. Choose the task that matches the place you have stopped.

• How to Solve Sudoku: A Practical Beginner’s Guide

  Learn the three constraints, a safe first move, and the difference between a single candidate and a single position.

• How to Use Pencil Marks Without Filling the Board with Clutter

  Write complete candidates, clean notes after a move, and avoid treating a missing note as proof.

• Naked Single vs. Hidden Single: Find the Difference on a Real Grid

  Compare two kinds of certain moves with original diagrams and exercises.

• Sudoku X-Wing Explained: Spot the Pattern, Prove the Elimination

  Check the exact row and column conditions, prove a deletion, and reject a misleading rectangle.

• Stuck on Hard Sudoku? A Logical Routine Before You Guess

  Check your entries and candidates, inspect singles and pairs, and use a staged hint to continue.

• Your Daily Sudoku: Saved Progress, Walkthroughs and Clear Prints

  Keep the same daily puzzle, review its steps, and print a clean original with a separate answer.