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How to Play Sudoku
Goal: Fill the 9×9 grid so that every row, column, and 3×3 square contains all numbers from 1 to 9 without repeats.
Fixed digits (black) cannot be changed.
Pen Mode (✍️): Enters your final guess for that cell.
Pencil Mode (✏️): Places tiny candidate notes in the cell.
Hint (💡): Reveals the correct answer for the selected cell or a single candidate!
Controls: Tap or click any cell. Use keyboard 1-9 or the on-screen keypad. Arrow keys move selection. Press P to toggle notes, H for hint, Del to erase.
About RetroSudoku
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RetroSudoku v1.0
Windows 95 Entertainment Edition
Part of the RetroTech.io suite. 100% ad-free, tracking-free, telemetry-free, and kid-safe.