Sudoku difficulty levels—from your first single to a master-level chain.
Sudoku a Day has five levels: Easy, Medium, Hard, Expert, and Master. The real difference is the solving path—what you must notice, prove, and eliminate—not simply how many numbers are already filled in.
Choose the level that keeps you thinking without forcing you to guess.
Five levels. One logical progression.
Move up when the current level feels repeatable, not merely when you finish one unusually friendly puzzle.
See what changes as the puzzles get harder
Choose a level to compare its solving rhythm, core techniques, and one representative deduction on a real grid.
Choose a difficulty level
Level 1
Easy
Easy puzzles build the core loop: scan, rule out impossible digits, place a certain answer, and scan again. You can usually solve without filling every empty cell with notes.
- What it feels like
- Progress is steady and most placements appear after a clean scan of a row, column, or box.
- Best for
- First-time players, short sessions, and practising accurate scanning.
- Move up when
- You spot last digits, naked singles, and hidden singles without losing your place.
Representative Naked singles: place the only candidate move
Keep the one legal candidate
R5C5 contains just one note: 5. The other open cells remain full of possibilities, but this cell is solved.
The five Sudoku levels at a glance
These descriptions explain the typical techniques and experience at each level. An individual grid can still feel easier or harder depending on which patterns you recognise quickly.
Level 1
Easy
Progress is steady and most placements appear after a clean scan of a row, column, or box.
Easy puzzles build the core loop: scan, rule out impossible digits, place a certain answer, and scan again. You can usually solve without filling every empty cell with notes.
Typical techniques
Move up when: You spot last digits, naked singles, and hidden singles without losing your place.
Level 2
Medium
The opening still moves quickly, but easy scanning eventually stops and candidate notes become useful.
Medium introduces light eliminations, early pairs, and box-line interactions. The puzzle asks you to keep notes current rather than hold every possibility in your head.
Typical techniques
Move up when: You maintain clean notes and can turn a pair or box-line restriction into fresh singles.
Level 3
Hard
You may make several eliminations before a new number can be placed, so patience starts to matter.
Hard puzzles depend more consistently on pairs, subsets, and pointing or claiming interactions. A productive move may remove one candidate without filling a cell immediately.
Typical techniques
Move up when: You can prove candidate eliminations systematically and re-scan after each one.
Level 4
Expert
Obvious local moves run out. Progress comes from recognising patterns that connect distant rows, columns, or boxes.
Expert puzzles bring in fish, wings, colouring, and longer pattern-based deductions. The important skill is proving why a target candidate sees every possible outcome.
Typical techniques
Move up when: You recognise advanced patterns reliably and can explain each elimination without relying on the picture alone.
Level 5
Master
Long quiet stretches are normal. A single breakthrough may require several linked implications.
Master puzzles can require advanced fish, almost locked sets, uniqueness reasoning, and forcing chains. Candidate discipline and a clear proof matter more than speed.
Typical techniques
Move up when: There is no next label to chase—use Master when its solving process is enjoyable, not as an obligation.
What actually makes a Sudoku harder?
Clue count can affect the opening, but it does not define the whole experience. The required deductions are the more useful measure.
Required techniques
A harder puzzle withholds progress until you use a more advanced elimination than singles or basic scanning.
Depth of deduction
Some moves need several linked observations before they produce a placement or candidate removal.
Constraint distribution
Information spread evenly across the grid can hide the next useful area and make local scans less productive.
Candidate discipline
Higher levels reward complete, current notes. One stale candidate can conceal the pattern you need.
Aim for flow, not frustration
The right level gives you enough resistance to learn while still producing deductions you can understand.
- 1
Start one level lower than your ego
If you are unsure, begin with Easy or Medium. A completed logical solve teaches more than an abandoned difficult grid.
- 2
Use time as feedback, not a verdict
If puzzles regularly take longer than you enjoy, step down. If the whole solve feels automatic, sample the next level.
- 3
Move up when the method feels repeatable
One fast solve may be a friendly grid. Look for consistent comfort with the techniques before changing your default.
Sudoku difficulty questions
What determines Sudoku difficulty?
The solving path matters most: which techniques the puzzle requires, how deeply deductions must be linked, and how hard the useful pattern is to recognise.
Does fewer given numbers always mean a harder Sudoku?
No. A sparse puzzle can have an easy logical path, while a fuller-looking grid can hide an advanced deduction. Clue count alone does not predict the required techniques.
Is Expert harder than Hard?
Yes. Hard focuses mainly on candidate sets and box-line interactions. Expert more often requires patterns such as X-Wing, Swordfish, colouring, or wings.
Which Sudoku level should a beginner choose?
Start with Easy. Move to Medium when you can find singles consistently and are ready to use pencil marks without letting them become stale.
Put the guide to work
Choose a level and solve one certain move at a time
Start where the logic feels clear, update the board after every placement, and use the strategy library when your usual scan stops producing progress.