Large-Print Hard Sudoku — Free Printable
A proper challenge in large print. You'll want pencil marks, and you'll need to spot pointing pairs and naked pairs — but never guess. Our step-by-step guide to Sudoku techniques explains each one with pictures.
Hard Sudoku
Fill every row, every column and every 3 × 3 box with the numbers 1 to 9.
Answer key
Hard Sudoku · the starting numbers are in bold
Stuck?
Look for a square where only one number fits, or a number that can only go in one square of a row, column or box. Our step-by-step guide to Sudoku techniques, with pictures, is at sunroomgames.com/guides/sudoku-techniques.
Printing tips
- Use Letter paper (8.5 × 11 in). The puzzle prints on page 1 and the answer key on page 2.
- Only want the puzzle? In the print window, choose to print page 1 only.
- Set the scale to 100% (it may be called "Default" or "Actual size") so the numbers print full size.
- To keep a copy, pick "Save as PDF" as the printer.
- Free to print and copy for home, classroom and care-home use.
How to play
Fill the grid so that every row, every column and every 3 × 3 box contains the numbers 1 to 9 exactly once. Every puzzle here has exactly one solution, and you can reach it by logic alone — no guessing. New to Sudoku, or stuck? Our step-by-step guide to Sudoku techniques walks through every technique you'll need, with pictures. You can also play Sudoku online, with pencil marks and hints.