I got the Dr. Dreadful set for my son several years ago. As I remember I had to help my son assemble the lab and also follow the directions with the recipies. It was a great time for us both. One recipe I remember is making up a thick black jelly and then squirting them a certain way into a clear soft gel so that they looked like leeches in water,,,and it did look like that,,,and then we at it. It was a lot of fun but I don't think a 7 year old would have enjoyed it as much if they didn't have help.