If you’re looking for a good way to kill time then you might be interested in Crossword Light for the iPhone . It's a free app that comes pre-loaded with 60 crossword puzzles though there is a paid version that comes with daily puzzles if you'd like. Crossword Light has an easy to use interface that can be tilted 90-degrees if you'd like a different angle on things and also offers a variety of hints for those who are stuck in a bind.