With all the smart phones and tablets in the world i find it very nice to hand this to my nephews and have them use the mind and figure how to open it up. My husband is in his 30s and he enjoys the challenge when trying to get this open. You can put prizes inside or cash inside and giv them more of a reason to try to win at this game. It is no crazy hard to win at which is great for my nephews..
(I received this product for free or at a discount price but my opinions are my own)