Naked Quad Practice Puzzles

A Naked Quad is four cells in the same unit that together contain only four candidate digits. Those digits can be eliminated from every other cell in the unit.

Every puzzle below is verified to feature the Naked Quad as its hardest required technique — of the 65,284 puzzles in our library, 4,499 require it and 4,137 need nothing harder. New to the pattern? Learn the Naked Quad or see a worked example first.

Curated Naked Quad puzzles

  1. Practice puzzle #1 — 24 givens · needs Naked Single, Hidden Single, Naked Quad
  2. Practice puzzle #2 — 24 givens · needs Naked Single, Hidden Single, Naked Quad
  3. Practice puzzle #3 — 24 givens · needs Naked Single, Hidden Single, Naked Quad
  4. Practice puzzle #4 — 25 givens · needs Naked Single, Hidden Single, Naked Quad
  5. Practice puzzle #5 — 25 givens · needs Naked Single, Hidden Single, Naked Quad
  6. Practice puzzle #6 — 25 givens · needs Naked Single, Hidden Single, Naked Quad
  7. Practice puzzle #7 — 26 givens · needs Naked Single, Hidden Single, Naked Quad
  8. Practice puzzle #8 — 23 givens · needs Naked Single, Hidden Single, Naked Quad
  9. Practice puzzle #9 — 25 givens · needs Naked Single, Hidden Single, Naked Quad
  10. Practice puzzle #10 — 25 givens · needs Naked Single, Hidden Single, Naked Quad
  11. Practice puzzle #11 — 24 givens · needs Naked Single, Hidden Single, Naked Quad
  12. Practice puzzle #12 — 23 givens · needs Naked Single, Hidden Single, Naked Quad
Get a fresh Naked Quad puzzle →

Naked Quad practice FAQ

How many Sudoku puzzles require the Naked Quad technique?
Of the 65,284 puzzles in the Precision Sudoku library, 4,499 require the Naked Quad to solve, and 4,137 can be completed with nothing harder than the Naked Quad. Every puzzle is verified by a solver that records the exact techniques needed.
What is the best way to practice the Naked Quad?
Play puzzles where the Naked Quad is the hardest move required, so every sticking point is an opportunity to apply it. Quads are rare; check for one when pairs and triples leave a unit only partly resolved.
Can I play a Sudoku puzzle that needs exactly the Naked Quad?
Yes. The curated puzzles on this page all feature the Naked Quad as their most advanced required technique, and the practice button serves a fresh puzzle from the same verified pool whenever you want another.