Crypto uses a substitution cipher to encrypt one of over 76000 quotes, for you to try to solve.
In a substitution cipher, one letter is used to replace another in the quote. For example, all of the E's in the quote might be displayed as Q's. Only the letters have been substituted, all spaces, punctuation, etc... remain unchanged, to help you solve the puzzle.
Share a puzzle you completed, to give your friends the change to play the exact same puzzle with the same cipher and level of difficulty. Who knows? You might even get some free hints :)