My daughter received a Go-Go Hamster for Christmas so I have just bought her, for her birthday, the funhouse and this, the adventure ball. What a disappointment the ball is - the top pops off when the hamster is running in it, the hamster has to have a small piece of plastic attached to him underneath to stabilise him - this is difficult to attach (and easy to lose!) for small fingers. The Ball feels like cheap plastic: it springs apart easily (it arrives in two pieces which snap together) unfortunately the plastic is so flexible it can easily unsnap. This is a good example of overpriced rubbish - stick with the hamster and the smaller accessories, don't bother with this one!