Expert Sudoku
As few as 26 starting digits. The hardest level.
- Time
- 0:00
- Mistakes
- 0
About Expert Sudoku
Expert puzzles aim for as few as 26 starting digits, the fewest on PuzzleGrids. Every one still has exactly one solution. Expert puzzles have very few clues. Keep full notes, expect to use advanced patterns, and use Undo freely when testing an idea.
How to play
Fill the grid so every row, every column and every 3x3 box contains each digit from 1 to 9 exactly once. Some cells are filled in to start, and there is only one correct solution.
Tap a cell, then tap a number. Turn on Notes to pencil in possible digits, and use Undo if you change your mind. A digit that breaks the solution is shown in red. On a keyboard, use the arrow keys to move, the number keys to fill, N for notes, H for a hint and Z to undo.
Tips for this level
- Keep every cell's candidates noted and up to date. Stale notes cause most expert-level mistakes.
- Learn the X-Wing: when a digit has exactly two possible cells in each of two rows, and they line up in the same two columns, remove it from the rest of those columns.
- When logic runs out, pick a cell with two candidates, try one, and use Undo if it leads to a contradiction.
New puzzles are generated in your browser and checked to have a single solution, so you can play as many as you like. Your progress is saved on this device. New to the game? Read how to play Sudoku.