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A cryptogram is a type of puzzle that consists of a short piece of encrypted text. The cipher used to encrypt the text is a simple substitution of letters and is simple enough that the cryptogram can be solved by hand.
Cryptogram for Android has some cool features:
• It works completely offline, so you can enjoy some brain teasers while traveling;
• Compare statistics about how well you're doing with friends;
• Keep track of which puzzles you've solved already and revisit them;
• Get help by revealing letters or showing hints.
Best of all, it's completely free, and free of ads! Enjoy!