🎯 Goal

Fill the grid so every row and every column contains each number exactly once — AND every outlined cage satisfies its arithmetic target.

🔢 The Cages

Each outlined region has a label like 12× or 7+ or 3.

• 12× — the numbers in this cage must multiply to 12
• 7+ — the numbers must add up to 7
• 3− — the two numbers differ by 3 (larger minus smaller)
• 2÷ — the two numbers divide to give 2 (larger ÷ smaller)
• 5 (no operator) — the single cell must contain 5

✏️ Filling the Grid

• Tap a cell to select it, then tap a number on the pad (or use keyboard).
• Cells with errors flash red — fix them before solving.
• Single-cell cages are pre-filled as givens — you can't change them.
• 💡 Hint reveals one correct cell.

⚡ Grid Sizes

4×4 uses digits 1–4. 6×6 uses 1–6. 9×9 uses 1–9. Larger grids = longer session, higher score!