Music Sudoku

What is Sudoku?

Sudoku is a logic puzzle on a 9×9 grid split into nine 3×3 boxes. Fill every empty cell so that each row, each column, and each 3×3 box contains every symbol exactly once — no repeats anywhere.

The Rules

• Every row must contain each of the 9 symbols exactly once.
• Every column must contain each of the 9 symbols exactly once.
• Every 3×3 box must contain each of the 9 symbols exactly once.
• Grey cells are given — they cannot be changed.
• Each puzzle has exactly one correct solution.

Symbol Modes

Switch between two symbol sets at any time — the puzzle doesn't change, only the display:

• Numbers — classic 1–9, great for getting started.
• Music Symbols — 9 symbols drawn randomly from a musical notation pool. Rarer symbols appear on harder levels.

Palette & Counts

The symbol buttons below the grid show each of the 9 symbols for this puzzle. A small number in the corner tells you how many of that symbol are still unplaced. When all instances are placed the button dims.

How to Play

• Click any empty cell to select it, then press a key (1–9) or tap a symbol in the panel below the grid.
• Use arrow keys to move between cells on desktop.
• Backspace or the ✕ button clears a cell.
• Cells that conflict with another in the same row, column, or box turn red.

Basic Strategies

• Scan rows and columns: Find which symbols are missing from a row or column, then see where in the crossing boxes they can fit.
• Single candidate: If only one symbol can go in a cell (nothing else fits without conflicting), place it.
• Box scan: Focus on one 3×3 box and eliminate symbols already present in its rows and columns.

Advanced Strategies (for experienced players)

Naked Pairs

If two cells in the same group can only hold the same two symbols, those symbols can be eliminated from all other cells in that group.

Pointing Pairs

If a symbol can only appear in one row (or column) within a 3×3 box, eliminate it from the rest of that row (or column) outside the box.

Box / Line Reduction

If all possible positions for a symbol in a row or column fall within one 3×3 box, eliminate that symbol from the rest of the box.

Got it — let's play!