Funny, we had problems too.
The rocket launcher base didn't work at first. I took it apart and put it together and then it worked, although the rocket doesn't launch too high since there isn't enough pressure build up. We are still working on our technique with the vinegar and baking soda reaction. Might try mentos and Diet Coke.
The light on the star base also didn't work. opened up the light bulb cover, rescrewed in the bulb and then it worked.
The one thing that I can't fitx is that the star base included two Southern Hemisphere star models, while it was supposed to include one Northern and one Southern. I don't live in Australia! I will email firstname.lastname@example.org and see if they can send us the correct one.
We haven't messed with the other Science set yet, but our expectations are low.