The 15-puzzle (also called Gem Puzzle, Boss Puzzle, Game of Fifteen, 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 object of the puzzle is to place the tiles in order by making sliding moves that use the empty space.
15拼图（也称为宝石拼图，老板拼图，游戏十五，神秘的广场和许多其他人）是一个滑动拼图，由一个框架以随机顺序编号的广场砖一瓦失踪。
这一难题的目的是为了将瓷砖滑动的举动，使用空空间。

提升体验，修复部分问题。