More Random Play enhancements

Version 1.24.0, which has just gone live in the App Store, brings more enhancements to Random Play:

• Added new logic to the puzzle generator in expert mode, making it possible for puzzles with hidden sum values to be generated with even more cunning!
• Tweaked the way that the difficulty of puzzles is estimated for puzzles with hidden sum values. These puzzles are now more likely to be estimated as one level harder than previously. This can mean, 5x5 puzzles generated in expert mode may be Very Difficult. A higher difficulty rating means more points are earned when these puzzles are solved.
• If an 8x8 puzzle is taking too long to generate, a new button makes it possible to skip to a smaller puzzle instead.
• When Keep It Simple is selected as play mode and an 8x8 puzzle is generated on demand, it will often be generated faster than previously.

Other changes in this version, benefitting all players:

• Minor cosmetic improvements to the menu page and Puzzle Sets overview.
• Improved error handling for when the app is unable to start up properly due to problems loading saved data.