A small sliding puzzle, could be printed pretty fast under 2 hours.
The goal is to move the player up to the top.
Might look impossible but there is a solution, as you can see by the picture.
A cool version is to do the reverse path to release the player, especially if the person doesn't know the initial solution.
if the player is moving too tight, you can scale the XY down a bit or add a horizontal expansion ( for example -0.1mm )
For my print the tolerances were fine.
Designed in Fusion 360
Difficulty - 2.5/5