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Sudoku-USA publishes Sudoku variation books. If you're familiar with Sudoku puzzles, you know that the puzzles are solved by filling in the digits 1 - 9 so that no row, column or 3x3 box in the puzzle has more than one of any of the digits.

Sudoku variations, like those from Sudoku-USA go beyond the classic game and challenge you to solve fun new puzzles.

Sudoku Islands

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Are you adrift in a sea of normal 9 x 9 Sudoku?

Chart yourself a new course to Sudoku Islands where in addition to the normal 9 x 9 Sudoku, four Islands float on top of each puzzle. Not only does each row, column and box contain 1 – 9 but each of the islands also contains 1 – 9.

Sudoku Earthquake

It's time to shake up the world of Sudoku with Sudoku Earthquake.

Sudoku Earthquake puzzles are regular 9x9 puzzles with a fault line on them. These squares are blank with the digits that go into them - in some order - shown at the bottom of the page. You'll need to work back and forth between the fault and the puzzle itself to figure these out.

Trividoku

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Every Trividoku™ Sudoku puzzle has sets of nine matching Trivia clues. Match them up to find the missing digits in the puzzle.

Don’t know the Trivia? Don’t worry- most of the puzzles can be solved without the Trivia; they’re just harder to solve that way.

The 101 puzzles in this book range from simple to fiendish. In the fourteen Triple Trivia challenges you are given three different sets of nine trivia matches. And in the Thunder Brain challenges, there may be as few as TWO digits filled in.

Stars & Stripes

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Is it time to declare your independence from ordinary 9 x 9 Sudoku?

In Stars & Stripes Sudoku, each 12 x 12 grid has the familiar 1 - 9’s, but also has three *’s in each row, box and column.