Back end performance improvements and bug fixes.

This app has been updated by Apple to display the Apple Watch app icon.

Fixed occasional problem in pinch-to-zoom

Save game in progress

- Completely redesigned to improve performance
- Added different tile-sets to choose from
- Added pinch-to-zoom
- Added sound.

Hide status bar for iOS 7

Fixed appstore link for iOS 6.0

Fixed score saving issue with iOS 5.1+

Fix shuffling problem that would make game too easy to solve.