penWord App has the following features:
1. For iPhones it allows for creating or playing 3x3, 5x5, 7x7 crossword puzzles.
2. For iPads it allows for 9x9, 11x11, 13x13, 15x15 crossword puzzles. It also provides full screen Canvas to use as a whiteboard for drawing & education purposes. A geometry learning example is included as a demo.