Many people enjoy a good word puzzle.
These have appeared in newspapers for years in a variety of forms. One popular type of word puzzle is the crypto-quote, where a phrase is written with one letter of the alphabet being substituted for another, forming a cipher. As its name implies, Cipher and are computerized versions of these puzzles. One problem with working a cipher on paper is that the trial and error involved just wears out the paper. A computer screen is much better for this kind of trial and error work.