Game of Fifteen: 15-puzzle with Flutter 1.4.2 [free]

The Game of Fifteen (also called 15-puzzle, Gem Puzzle, Boss Puzzle, Mystic Square and many others) is a sliding puzzle that consists of a frame of numbered square tiles
in random order with one tile missing.
The puzzle also exists in other sizes, particularly the smaller 8-puzzle.
The object of the puzzle is to place the tiles in order from first to last tile by moving the tile next to the empty space into it.

• 07/08/2020: Game of Fifteen: 15-puzzle with Flutter 1.4.2
• 02/13/2019: Game of Fifteen: 15-puzzle with Flutter 1.1.5
• 01/08/2019: Game of Fifteen: 15-puzzle with Flutter 1.1.0
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