Play Quadruple Sudoku Online Free

Play Quadruple Sudoku online for free. Clues at grid intersections show digits that must appear in the surrounding four cells.

▶ Play Quadruple Sudoku — Free
🟢 Easy 🟡 Medium 🟠 Hard 🔴 Expert

How to Play Quadruple Sudoku

  1. Standard Sudoku rules apply.
  2. Clues sit at the intersection of four cells.
  3. The listed digits must appear among those four cells.
  4. Other digits may also appear in those cells.
💡 Pro Tip
A quadruple clue showing all 4 digits tells you exactly what goes in those cells — you just need to figure out the arrangement.

Frequently Asked Questions

Can a quadruple clue list the same digit twice?

Yes — if a clue lists 5 twice, two of the four surrounding cells must be 5. That's only possible if they're in different rows, columns, and boxes.

Are quadruple clues exhaustive?

No — the clue lists digits that MUST appear in the four cells, but other digits can also be present.

Try More Puzzle Modes

🧩Classic Sudoku 🧩Killer Sudoku 🧩Even/Odd Sudoku
▶ Play Quadruple Sudoku