I purchased this toy for my sons birthday, we've had it out of the box 5 days and we've attempted to play with it only twice. My first impression, once out of the box was aweful, with the 25+ pieces I had to put together, which took about an hour, only for the end result to be about 5 minutes of play time before it started coming apart! The pieces of the track don't stay together from the jump start, most of his hot wheel cars won't work with it, the slime is completely aweful, messy and a pain to clean up. After each use you have to clean up the mess in order to preserve the slime. Tonight after 2 additional minutes of play time, I've decided to take my lost and throw it away entirely...except my son wants to keep the slime! $49 dollars for slime makes me want to gag. If there is a lemon law for toys, this one by mattel wins hands down!!!