Sudoku Uno and Sudoku Duo form a product family which traces its origins back to ACTSudoku for iPhone. Today, Sudoku Uno is available for iPhone, iPad and Mac. The dual player Sudoku Duo is available only for iPad.
All products are based upon the same powerful Sudoku engine. This allows Sudoku Uno & Duo to provide an almost infinite number of Sudoku games categorized in 3 levels of difficulty.
This Sudoku engine uses human logic to solve Sudoku puzzles. It can thus precisely evaluate how difficult to solve a board is going to be. The levels of difficulty are mapped to the techniques needed to solve the puzzle. Not the number of empty cells.
The same engine can also help you with smart hints. Not only will it help you solve the puzzle, it can explain the reasoning behind the hint.

Dual player Sudoku. Both players sit at opposing ends of the iPad. There are three modes to chose from: compete, collaborate, single player.
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Scaled down version of the above: limited to the single player mode.
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Finally available on the Mac. Fully controllable using both mouse and keyboard.
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Born in 2008 as ACTSudoku. With the name change came game scores. These are comparable across all versions of Sudoku Uno.
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