Pencilmark Sudoku

Classic sudoku

Variant sudoku

Every puzzle has exactly one solution. Difficulty is graded by the hardest technique the logic engine needs, not by clue count. For hand-set puzzles, paste an f-puzzles or SudokuPad link on the Paste tab.

Paste an 81-character string (dots, zeros or underscores for blanks), a 9-line grid, a Simple Sudoku / SudokuWiki text grid, several puzzles one per line, an f-puzzles link, or a SudokuPad link or its scl… puzzle data. Variant constraints load with their rules.

Drop a puzzle file here .txt, .sdk, .sdm, .ss or a Pencilmark .json backup. Multi-puzzle files are listed so you can pick one. Choose file

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Famous puzzles from sudoku history. Most go beyond the techniques the hint engine knows. Good luck.

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Classic sudoku

Variant sudoku

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