How this drafting table works
Fill every row, column and 3×3 box with 1–9 exactly once. Use pencil notes to test possibilities, then commit only when the logic is sound.
Blueprint Sudoku
Draft the only solution. Every mark should have a reason.
Blueprint SudokuDraft the only solution. Every mark should have a reason.
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Tip: press and hold a number to add a pencil note.
Keyboard and touch
Arrow keys move; 1–9 write; N changes pencil mode; Z/Y undo and redo; H opens a reasoning hint; P or Escape pauses. On touch, hold a number to make a one-off note.
A puzzle generated here
Every board is produced locally from a seed, verified to have one solution, and rated with logical-solving data. No branded puzzle set, artwork, melody or commercial scoring system is used.