What Makes a Puzzle Easy, Medium, or Hard?

Sudoku difficulty is usually determined by two main factors: how many numbers are given at the start, and which solving techniques are required. Easy puzzles typically have more given numbers (often 35 or more) and can be completed using basic scanning and single-candidate logic. Medium puzzles have fewer givens (often around 28–35) and may require pencil marks and simple strategies like naked pairs. Hard puzzles have fewer givens still and often need more advanced techniques such as hidden pairs or X-wings.

There is no single global standard: different publishers and apps use different scales and methods. Some rate by the number of logical steps required; others by the hardest technique needed. What matters for you is finding a level where you can make progress without guessing and without getting stuck every time.

Choosing the Right Level

Beginners should start with easy puzzles. They build confidence, reinforce the rules, and introduce basic pattern recognition. Once you can finish an easy puzzle without hints in a reasonable time, move to medium. If you get stuck often, stay at easy a bit longer or use hints to learn new strategies. There is no rush—enjoyment and steady progress matter more than speed.

• Easy: many givens, basic scanning and singles only.
• Medium: fewer givens, pencil marks and simple strategies.
• Hard: few givens, advanced techniques and patience.

Progressing at Your Own Pace

Difficulty is personal. One person's "medium" may feel hard to another. The goal is to pick a level where you are engaged and making progress. If a puzzle feels impossible, try an easier one or look up one new technique and practice it. Over time, what once felt hard will feel manageable.

For learning the rules, see our beginner's guide. For strategies, read Sudoku tips and strategies and how to get better at Sudoku.