Which pass to buy for Shedd Aquarium?

Going to the Shedd and I'm finding the info on their website for tickets a little unclear. General admission is $8, and then the next step up is $29! For $29 it seems like the only extra thing you get is a kids play ground and we are only going with adults. Also, do you know if you can add on the Jellies exhibit and the aquatic show to the general admission? Thanks All!