Rune Sudoku
Fill the grid so every row, column, and box contains 1-9
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About This Game
Rune Sudoku is a number-placement puzzle that challenges you to fill a 9x9 grid so that every row, every column, and every 3x3 box contains the digits 1 through 9 exactly once. Some cells are pre-filled as clues — the fewer the clues, the harder the puzzle. Three difficulty levels (easy, medium, hard) control how many starting clues you receive.
The game includes quality-of-life features that make solving smooth: pencil marks for noting candidates, error highlighting to catch mistakes early, and a clean interface that works equally well on desktop and mobile. Each puzzle is procedurally generated with a guaranteed unique solution, so there's always a new challenge waiting.
How to Play
- Each row must contain the digits 1-9 with no repeats
- Each column must contain the digits 1-9 with no repeats
- Each 3x3 box must contain the digits 1-9 with no repeats
- Click a cell and type a number (or tap the number pad on mobile)
- Use pencil marks to note possible candidates for a cell
- Complete the entire grid correctly to solve the puzzle
Tips & Strategy
Start with rows, columns, or boxes that have the most filled cells
Use pencil marks to track candidates — eliminate numbers as you place them
Look for naked singles (cells with only one possible candidate)
Scanning rows and columns for missing numbers is faster than checking every cell
Features
✓ Three difficulty levels
✓ Pencil mark support
✓ Error highlighting
✓ Procedurally generated puzzles
✓ Timer tracking
✓ Clean grid interface
Controls
| Platform | Controls |
|---|---|
| Desktop | Click a cell, type 1-9 to fill. Shift+click for pencil marks. |
| Mobile | Tap cell, tap number pad to fill. |
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