Just one penny. However, I have no idea how well this works, or even if it does work, since I only have first gen Kindles and this is for the K2 or DX. I'd sure be interested in hearing how well this works, though.
Interactive Sudoku for Kindle 2 and Kindle DX - Volume 1 (Mobi Games)
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Our best interactive Sudoku puzzles are now available for Kindle!
Whether you are a novice to Sudoku or an experienced player this collection will sharpen your mind.
Each Sudoku volume contains 20 different Sudoku puzzles: five puzzles for each difficulty level.
The objective a Sudoku game is to fill a 9X9 grid so that numbers 1 through 9 occur exactly once in each row, column, and 3X3 box.
With Mobi Sudoku you can:
Check your progress at any time. The number of wrong entries will be reported.
Remove errors. Use it if you feel you made too many mistakes and want to keep your correct entries but remove incorrect ones.
See the solution
Reset the puzzle if you want to start over.
Add a clue if you feel that you are stuck. A single number will be added to a randomly chosen empty cell.
Note: Whispernet wireless needs to be turned on when a new game is loaded. Once a game is loaded, wireless can be turned off to conserve battery power.