There are three balls in this 3d maze.
There is only one way out.
Your aim is to get all balls out.
It's actually quite hard.
Once you get all balls out, you can try to get them back into the original position again.
Once you are confident, you can compete with your friends and see who is fastest.
See nice photos here: https://lonelyrobots.com/index.php/2017/10/01/maze-world-mazes/
If you would like a more casual challenge, please check out the other mazes in my shop.