Fun with Kitchen Chemistry

Hey!
I found one interesting fun chemistry site... on acids and bases for you guys!
The link is below:
http://pbskids.org/zoom/games/kitchenchemistry/index.html

Click on the virtual kitchen chemistry and have some fun. Follow the clues and instructions to complete the challenge.

I think there is some sort of reward at the end of the challenge... you try and let me know what is it.