This is a toy for kids 5 and up. Using water that flows through tubes and into a chamber into which you put a "reactor pod" which you buy for about $3 each. The water dissolves the pod and reveals a small, plastic, collectable creature. We've used up our pods, but the apparatus for working with them is all included. You can look here to see how it works: https://www.youtube.com/watch?v=R5QQEzs1gVE