Description: At the beginning, it should randomly place the numbers and the blank space on the GUI.
• When the player clicks a square, it should check to see if the blank is a neighbouring square (either
on the horizontal or vertical) and move the tile there，When the user holds their mouse button over a tile, it should change colour as indicated，The game terminates when the tiles are in order or the user gets fed up。
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File list (Check if you may need any files):
final\PuzzleTile.class
.....\PuzzleTile.java
.....\SlidingPuzzle.java
.....\SlidingPuzzle1.class
.....\Tile.class
.....\Tile.java
final
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