Sudoku levels compared
There are seven levels: Easy, Medium, Hard, Expert, Master, Extreme and Insane. A level is defined by the solving technique a puzzle needs, not only by how many numbers are given, so a harder level can call for stronger logic. Every puzzle has exactly one solution and can be finished without guessing.
The seven levels side by side
Easy and Medium promise a minimum of given numbers. From Hard upwards the number of givens is not fixed, because the technique decides the level.
| Level | Given numbers | Hardest technique |
|---|---|---|
| Easy | At least 38 | Singles |
| Medium | At least 32 | Locked candidates |
| Hard | Not fixed | Pairs, triples and quads |
| Expert | Not fixed | X-Wing, XY-Wing |
| Master | Not fixed | Swordfish, XYZ-Wing, W-Wing, colouring |
| Extreme | Not fixed | Always a forcing chain or a Jellyfish |
| Insane | Not fixed | Always a deep forcing net |
Which level to start with
If you are new to sudoku, start on Easy and move to Medium once you finish a grid without a hint. If you already use pencil notes, Hard is the first level that needs them. Expert and above are for players who know, or want to learn, named patterns such as the X-Wing.
Pick a level from the New game button, or open a level page from the links below. The game remembers the level you played last.