Instruct: Classify Amazon reviews into positive or negative sentiment
Query: this is not worth the money!

I am very disapointed!! one wrong move and it comes crashing down!! I must not have the secret that everyone else has.. but my children are very upset when it falls.. as am I because I have to spend time building it up again. I'm sending ours back! PLUS the marble stops in the middle of the track and we have to push it which one hard push and there it comes down yet again!! what am I doing wrong??