Who this level is for
Expert Sudoku is built for experienced players who enjoy sustained candidate analysis.
SudokuIQ puzzle
Play Expert Sudoku online
Solve a free expert Sudoku with notes, smart hints, coaching and local progress. Each board is generated from a valid solved grid and checked for a unique solution.
Logic you will use
Pairs, triples, locked candidates and advanced scanning may combine before a safe placement is available.
How to practise
Record candidates consistently, search for structures rather than isolated cells, and use Coach to inspect the proof when your own route stalls.
Why can an Expert board feel stuck?
The next deduction may remove a candidate rather than fill a cell. Look for matching candidate sets and interactions between a box and a line.
Is Expert timed?
The timer records your session but does not impose a deadline. You can pause and solve at your own pace.