Working principle: the only way to get your money out after storage is solving the puzzle by maneuvering the bead through the maze and make it to certain place. For all ages: Good toy to increase the intelligence of kids, release the working pressure of the adults, enjoy hours of fun with your family and friends. Money saving box: functionally the same to a piggy bank for developing interests and hobbies of saving money daily. Drop the coins or bills through the slot on the top but get the money by solving puzzle. Safe material: solid ABS plastic is very safe and non-toxic. Harmless for kids to touch and play with. More, it is durable for long time use. Best gift ever: Solving the maze is a beneficial behaviour for your kids to improve the concentration of solving complex problems and the spirit of hard-working, foster kids' logistic, enhance the memory, etc.