Expert Sudoku for 2026-06-21

Expert Sudoku puzzle published on 2026-06-21, with 28 given clues. Solving it requires the following techniques: Hidden Single, Naked Single, Pointing Pair, Claiming, Naked Quad, Skyscraper, Naked Pair, XY-Wing, XY-Chain, 2-String Kite, W-Wing. 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.