Hidden Single Practice Puzzles

A Hidden Single is a digit that can legally go in only one cell of a given row, column, or box, even though that cell still shows other candidates. Because the digit has no other home in the unit, it is placed there.

Every puzzle below is verified to feature the Hidden Single as its hardest required technique — of the 65,284 puzzles in our library, 62,669 require it and 6,589 need nothing harder. New to the pattern? Learn the Hidden Single or see a worked example first.

Curated Hidden Single puzzles

  1. Practice puzzle #1 — 25 givens · needs Naked Single, Hidden Single
  2. Practice puzzle #2 — 24 givens · needs Naked Single, Hidden Single
  3. Practice puzzle #3 — 24 givens · needs Naked Single, Hidden Single
  4. Practice puzzle #4 — 22 givens · needs Naked Single, Hidden Single
  5. Practice puzzle #5 — 25 givens · needs Naked Single, Hidden Single
  6. Practice puzzle #6 — 25 givens · needs Naked Single, Hidden Single
  7. Practice puzzle #7 — 24 givens · needs Naked Single, Hidden Single
  8. Practice puzzle #8 — 20 givens · needs Naked Single, Hidden Single
  9. Practice puzzle #9 — 25 givens · needs Naked Single, Hidden Single
  10. Practice puzzle #10 — 23 givens · needs Naked Single, Hidden Single
  11. Practice puzzle #11 — 24 givens · needs Naked Single, Hidden Single
  12. Practice puzzle #12 — 24 givens · needs Naked Single, Hidden Single
Get a fresh Hidden Single puzzle →

Hidden Single practice FAQ

How many Sudoku puzzles require the Hidden Single technique?
Of the 65,284 puzzles in the Precision Sudoku library, 62,669 require the Hidden Single to solve, and 6,589 can be completed with nothing harder than the Hidden Single. Every puzzle is verified by a solver that records the exact techniques needed.
What is the best way to practice the Hidden Single?
Play puzzles where the Hidden Single is the hardest move required, so every sticking point is an opportunity to apply it. Reach for it right after Naked Singles. Cross-hatching a box, scanning rows and columns for a digit, is the fastest way to surface them.
Can I play a Sudoku puzzle that needs exactly the Hidden Single?
Yes. The curated puzzles on this page all feature the Hidden Single as their most advanced required technique, and the practice button serves a fresh puzzle from the same verified pool whenever you want another.