Puzzle is replaced by a 4x4 image.
Changed last puzzle piece to a recognizable image.
Implemented sliding of multiple pieces at once. It actually made the
sliding of one piece easier as well.
Removed unnecessary layouts.
Implemented 3x3 puzzle.
Cleaned up code, almost finished. Need a launcher icon.
Finished! I think...
Changed min SDK from 14 to 8. No longer using a GridLayout so should be
possible.