This puzzle works like the traditional number slider puzzles that kids have been playing for years. Press 'S' to scramble the puzzle. Click on a tile in the same row or column as the blank tile and the tiles between the one you clicked and the blank space will move one over. The goal is to arrange the numbers in order from one in the upper left first across in a row then continuing in the next row.
This is all original work by me. This was my first Scratch project, so sorry if it is a bit sloppy. You can change the size of the puzzle in the code of the RedTile sprite by setting the rowCount or colCount to any number between 2 and 5.