The puzzle consists of fifteen square tiles, labelled from 1 to 15, and an empty space. The object of the puzzle is to place the tiles in order with the empty space at the bottom-right corner by making sliding moves that use the empty space.

Project page: https://scratch.mit.edu/projects/196217625/

Video tutorial :

https://youtu.be/S58RGAr1CdE

十五数字推盘滑块游戏

https://youtu.be/YsXNhQHo_uM