This is cool, but I imagine those sprinkles might easily fall off or be shifted. The packaging they put edibles in are often crazy strong, but just the act of prying at the packaging or solving the puzzle might put your sprinkles at risk. Maybe temperature changes too would cause trouble.

Why not just print a key on the packaging? Or have each one wrapped individually in paper or what have you with a key. Might make better sense for other drugs. A database like this would provide some interesting info.