Expert Sudoku for 2026-05-21

Expert Sudoku puzzle published on 2026-05-21, with 29 given clues. Solving it requires the following techniques: Hidden Single, Claiming, Naked Triple, Naked Quad, Pointing Pair, X-Wing, Naked Single, Skyscraper, W-Wing, XYZ-Wing, XY-Chain. Every puzzle on this site is generated by Dancing Links and then verified by a tiered human-style solver, so it is guaranteed solvable with logic alone – no guessing or backtracking.