By default, the game takes you through the clues in order starting with clue 1. After you fill in a clue you are taken to the next one.
You can also complete the puzzle in any order you want by clicking a numbered square to fill in that clue.
Use the "Check" feature to check a letter, word or every word in the entire puzzle.
Use the "Hint" feature to be given a letter, an entire word, or every word in the puzzle.
When you complete the puzzle if you have answered all the questions correctly, it will collapse into itself and then unfold back to the completed puzzle. If this does not happen use the "Check Word" feature to check every word in the entire puzzle - incorrect words will be highlighted.