Sudoku archive
Three difficulties published every day, alongside a growing collection of special-shape Sudokus.
Special-shape puzzles
Grids where the given clues form a recognisable outline in the 9×9 grid. Each shape is available across multiple difficulties, so you can take on the same picture as an Easy, Intermediate, or Expert puzzle. Every special puzzle is a proper Sudoku – a single unique solution, reachable by logic alone.
Daily archive
Three puzzles every day – Easy, Intermediate, and Expert – each with a unique solution. Past puzzles stay available, so you can always go back to any date you missed.
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Difficulty is honest. An Easy puzzle uses only naked singles, hidden singles, pointing pairs, and claiming pairs. An Intermediate puzzle requires at least one naked or hidden subset (pairs, triples, or quads). An Expert puzzle demands at least three advanced techniques – fish, wings, chains, or uniqueness arguments – and cannot be fully solved at the Intermediate tier. That means no hidden traps: if a technique is beyond the stated tier, the puzzle will never ask for it.
On every puzzle page, the Techniques button in the header opens a full reference – every method from naked singles up to Forcing Chains, each with a plain-English explanation of how it works, and the ones required by that day’s puzzle highlighted.