Inside3 puzzles involve a ball and a blind labyrinth. The aim being to navigate the ball through the maze that you can’t actually see!
The Mortal model of the Zero series puzzle, the hardest of the hard and really only for those that have serious patience.
Usually you find a map on the front of the Zero series puzzles but that is not available for level Mortal. Plus there’s no opening up the box if you get stuck so once the ball is in you may not see it again.