Unlike your ordinary puzzle, these puzzles have tiles that you slide around until the picture is made. These puzzles have one tile missing and you come up with different strategies to move around the tiles until the picture is finished.

Easy:

https://www.proprofs.com/games/puzzle/sliding/pizza-puzzle/

Medium:

https://www.proprofs.com/games/puzzle/sliding/disney-puzzle/

Hard:

https://www.proprofs.com/games/puzzle/sliding/hogwarts-puzzle/