In Mystery Crosswords, each puzzle is a 9 x 9 crossword puzzle that as a bonus has a mystery word running diagonally from top left to bottom right. A clue to the identity of the word can be found in the puzzle title.You may play the puzzles on your computer, print them out for solving elsewhere or save them for finishing later. You may get hints or check for each letter, word or the whole puzzle. The shareware version comes with 5 puzzles, the registered version 50. The program is fully functional.