Rubik's Cube Puzzle Safe How do you keep your Rubik's Cube puzzle safe? Hide your treasures where no one will find them. The Rubik's Cube Puzzle Safe is pure genius! Pure genius! How do you keep your Rubik's Cube puzzle safe? By changing it into a Rubik's Cube Puzzle Safe! This 3 1/2-inch Rubik's Cube Puzzle Safe will hide all your treasures where no one will think to find them. In its 'completed' form, the puzzle is in the 'locked' position, but when you turn the 3 middle layers a certain way, it opens to access your private secret compartment. It's pure genius! Ages 8 and up. (Don't worry, it's not as hard to solve as an actual Rubik's Cube.)