Puzzle Solver

v1.9
- Added support for triangular and diagonal moves in Solo
- On-board buttons (Undo, Restart, Solve)
- A message appears when no more moves are left

v1.62
- Changed icon
- Fixed Solo custom boards bug

v1.6
- New scores screen.
- Better support of larger screens.
- One new Solo theme.
- Option for displaying connecting lines in Knight's tour.

v1.5
New puzzle selector

v1.4
Solo: Added custom boards feature. User can create and solve her own boards.