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Only use the numbers 1-9
Each number 1-9 should only appear once in each line vertically and horizontally.
In the sub grids marked with bold lines the numbers 1-9 should appear here once too.
The yellow areas in the grid demonstrate this.
Simple but great way to keep your brain working.
Download a free PDF file containing 36 unique suduko puzzles, each download will contain a unique set of grids as no two books are the same.
There is no restriction on how many books you can download and each one contains the solutions to each puzzle and can be printed as many times as you want.
There isn't one, we don't even want your email address or any personal information before you download. Simply click on the link below and download a free ebook in PDF format of 36 sudoku puzzles and solutions.