Puzzle Baron's Cryptograms: Volume 1 ($1.99), by A Gamz, contains a series of codebreaking puzzles for Kindle.
Book Description
Cryptograms are popular word puzzles that will test your deductive and word finding skills as you decode a series of letters to reveal a hidden message.
Puzzle Barron's Cryptograms contains one hundred puzzles. Each is a quote, and is organized into popular categories like Ancient Wisdom, Celebrities, Philosophy and Sports. Special features include displaying the letters remaining in a puzzle and letter frequencies to further assist the solver. Three difficulty levels will challenge beginners and seasoned players alike, and there is a hint option if you get stuck. When you finish the puzzle, you'll see a graph showing how your time compares to other people who have completed this puzzle and the number of hints taken if any.
If you like word games or logic puzzles, Cryptograms is a fun way to exercise your brain!