Did you strut around like a boss when you beat Rubik’s Cube? That’s cute, but now you can earn that strut by mastering this brain-busting challenge. Think you have what it takes?

Chances are pretty good you’ve never encountered anything like the Inside³ Labyrinth Puzzle Cube… because it’s hard to believe there’s a second “game” out in the world that’s as cruel as this one.

The objective sounds deceptively simple. Within the cube are seven labyrinth levels. Drop the little metal ball in the top and then work it through the various levels until it comes out the other side. Simple, right?

Oh. Almost forgot to mention it, but you won’t actually be able to see where the ball is within the myriad of mazes. Luckily, the first three Puzzle Cubes (Easy, Mean, and Awful) have little map diagrams on the side that reveal the path that needs to be followed. Also, if you don’t mind cheating, the cube can be taken apart. That doesn’t help with completing the challenge but at least you can retrieve the ball and start over.

However, once you advance to a Level 4 cube (Vicious) you lose the helpful diagrams… but you can still take the cube apart if you get in a jam.

Finally, there’s the Level 5 cube (Mortal). Just look at it, sitting there acting all sweet and innocent. You’ll soon learn this cube is named ‘Mortal’ because it puts you in touch with your own mortality. No diagrams and no taking the cube apart. You are relying 100% on skill and luck.

Each of the Puzzle Cubes costs $30.09 so you’re looking at a total of $150.45 for the full experience. For the sake of your sanity, we don’t recommend going straight for the Level 5 cube. That way lies madness.