My 7 year old son got taken in by the TV advert for this one so we were obliged to buy it him for Xmas. I had anticipated that it would be rubbish but its worse than that...essentially I have spent good money on a flimsy box of tat. The instructions are poorly written, the tricks wouldnt fool a senile mule and - aside from the pure immorality of selling such a pile of poorly thought out rubbish -there is very little gross about the contents (3 tiny tubs of "slime", a couple of plastic cockroaches, fake eyeballs that wouldnt fool Gordon Brown and...some string).
The only good thing about this product is that my son no longer trusts the TV. A lesson in life then, hence the 5 star educational value.