Sudoku

How to Play

Fill the grid so every row, column, and 3×3 box contains the digits 1–9 exactly once.

• Select a cell, then choose a number from the keypad.
• Notes stores pencil marks instead of final answers.
• Undo / Redo works for numbers, notes, erase actions, and hints.
• Hint fills the selected empty cell, or another empty cell if none is selected.
• The generator removes values only when the puzzle still has exactly one solution.
• Rows, columns, 3×3 boxes, and matching numbers are highlighted for easier scanning.