Sometimes secret messages are hidden in the word search. In one variation, the secret message is created by all the words that are written backwards in the puzzle. In another variation, the secret message is created by the letters that are not used in any word within the puzzle. This variation is more common in more difficult puzzles where most letters are used. Kappa Publishing is well known for this. Their Magazines are called "The Magazine with the Last Message" or other saying that is related.
