I have ten crossword puzzles that you can use (thanks to Amy Peterson for providing some of her own crossword puzzles) as time fillers and basic theory revision. The puzzles are self-contained in HTML files and are opened and run in your web browser.
You can also create your own crossword puzzles using the free software called Eclipse Crossword. Download the software at http://www.eclipsecrossword.com/
Download the crossword puzzles here : https://copy.com/TfSiOPaMKpcA