Slider Puzzle

This is an image Slider Puzzle. You have to arrange the shuffled pieces of an images by sliding them.

***** Features *****
3 Customizable sizes (3X3, 4X4 & 5X5)
Any image can be selected from gallery
Save and resume option
Hint option for solving the puzzle
Original image can be referred any time while solving
Timer Display
Best time tracked for each size individually

Please, let me know your opinion and suggestions about the game in order to improve it.