12x12 Hard Sudoku Puzzles
Challenge your brain with these free printable 12x12 hard Sudoku puzzles. Sharpen your mind with these simple and fun brain teasers. Download, print and enjoy hours of addictive puzzle-solving fun.
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12x12 Sudoku - Hard - 4
12x12 Sudoku - Hard - 6
12x12 Sudoku - Hard - 1
12x12 Sudoku - Hard - 10
12x12 Sudoku - Hard - 7
12x12 Sudoku - Hard - 9
12x12 Sudoku - Hard - 2
12x12 Sudoku - Hard - 8
12x12 Sudoku - Hard - 5
12x12 Sudoku - Hard - 3
Basic Rules / How to Play
- Grid Size: The puzzle has 12x12 grid size made up of twelve 4x3 sub-grids.
- Unique Numbers: Each row, column, and sub-grid must contain all digits from 1 to 12 without repetition.
- Pre-Filled Numbers: The numbers given at the start of the puzzle must remain unchanged.
Need Help?
To get started, check out these instructions, goals and rules for how to solve Sudoku
How to Download & Print
Click the puzzle thumbnail to open the printable PDF. In the print dialog, ensure "Actual Size" is selected for the sharpest grid lines.
