Sudoku · Medium
Puzzle #11
9×9 grid · 30–36 givens · Answer key included
Puzzle Preview (row 1)
Fill every row, column, and 3×3 box with the digits 1–9. Each digit appears exactly once in each row, column, and box. No maths required — pure logic.
Free · A4 format · Includes answer key · No account needed
Why Sudoku Is Good for Your Brain
Sudoku is one of the most effective non-digital brain training activities available. Regular solving builds the same cognitive skills targeted by professional brain-training programs.
- Strengthens working memory — holding and manipulating numbers mentally
- Builds logical deduction and elimination skills
- Improves concentration and sustained attention
- Reduces cognitive decline risk through regular mental engagement
- Can be completed at any pace — ideal for seniors
Frequently Asked Questions
Does this Sudoku include an answer key?
Yes — the downloaded PDF includes both the puzzle page and a solution page. The answer key is on the second page so you can fold it away while solving.
How hard is the medium difficulty?
Medium puzzles have 30–36 givens — a moderate challenge that requires basic elimination techniques like scanning rows and columns for single candidates.
Is this puzzle free to print?
Yes — all MendMemory worksheets are completely free. Download the PDF and print as many copies as you like for personal use.
Are these puzzles suitable for seniors?
Absolutely. The printable format uses large, clear type that is easy to read. The easy difficulty is particularly popular with seniors who are new to Sudoku.