CHALLENGE: Open the secret box to keep safe the secrets of the heart.

A very difficult box, designed for lovers, for friends and for all puzzle collectionists.

An extremely complicated sequential lock makes the resolution of the`enigma long and tiring. Very few people could open this enigmatic box without a suggestion or solution in their hands!

Since its difficulty is high, will you be one of those people? The mechanism used to open it is really ingenious and difficult to imagine, especially if you are not familiar with the world of puzzles.

Difficulty: INCREDIBLE 5/6.

Average solution time:

1. Beginners - about 1 year;
2. Intermediate puzzlist: <1 week;
3. Expert puzzlist: 30 min - 1 day.

Game dimensions: 9 x 9 x 9 cm

Inner space: 6 x 6 x 5 cm. We do not recommend to put in rings or similar small objects, because they could block the mechanism inside.

Box dimensions: 12 x 12 x10 cm

PACKAGED IN AN EUREKA COLOURED BOX.

Created by Benno, university professor at the TU University of Delft, Netherlands.

Author inspiration: "I made the first version of the box when I was in the last year of my high school. This version didn't have any 45 degree cuts, and the box would have a lid instead of the way it opens up now. The box was a birthday present for a close friend. That’s why I chose this design. I wanted to make a box with nothing which could move on the outside. Most boxes have sliders or at least something to Interact with on the outside of the box.