Oskar's Treasure Chest - Twisty Cube Secret Box Style By Meffert's

I like the concept of placing money inside the small compartment, mixing the cube, and give it for someone to solve. You need to be careful, when the cube top is not locked to the bottom part, it tends to fall apart, but once the two parts are locked, it is a great cube to play with.

The deal-breaker for me is that the top didn't hold together even you lift it off the solved puzzle. I spend too much time reassembling the top, which detracts from the idea of having a cube with a secret compartment. It is that, and you might not mind, but I do.