Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Huge Flaw...

Used this twice - it worked ok. The kitties didn't immediately get the hang of it, but I think they were starting to figure it out. We'll never know - because it is in the trash! The top half of the ball is two layers of plastic that rotate so that you can adjust the size of the openings - lots of food crumbs got caught between the two pieces of plastic - and I could find no way to separate the two pieces to clean it out. I'm not a clean freak at all - but that would have turned into a stinky, unhealthy bacteria-fest really fast! Yuck!