6×6 Sudoku (Hard)
Harder 6 × 6 puzzles with fewer clues. Click New worksheet for a fresh sheet, then print it with its answer key.
About this puzzle
Printable sudoku puzzles for kids and adults: 4 × 4 grids for beginners, 6 × 6 for the next step, and the classic 9 × 9. Every puzzle is generated fresh and checked to have exactly one solution, so it can always be solved by logic alone. Print one large puzzle or several on a page. The answer key shows the completed grids.
Tips for parents and teachers
- Each row, each column and each outlined box must contain every number exactly once.
- Start with the row, column or box that has the most numbers filled in.
- Write small pencil notes for the numbers a square could be, and erase them as you rule them out.
- Begin with 4 × 4 puzzles: children as young as five can solve them.
Questions
Are these worksheets free?
Yes. Every worksheet on this site is free to print and use at home or in your classroom. There is no sign-up.
How do I get a different worksheet?
Click “New worksheet”. The generator makes a fresh sheet every time, so you can print as many different sheets as you need. Copy the page link to come back to the same sheet.
Is there an answer key?
Yes. Switch to “Answer key” to check it on screen, or use “Print + key” to print the worksheet and its answer key together.
Can I print on A4 paper?
Yes. Choose US Letter or A4 before printing; the layout fits both. To save a PDF, pick “Save as PDF” in your browser's print window.
Which grade is this for?
This worksheet suits 3rd grade, 4th grade, 5th grade. Use the options to change it or make it easier or harder.