I can answer the second part. The majority of the games are free once you're in. There are a few things that cost extra, but we always just skipped them.
Our teens enjoy this, but it gets very crowded to the point that you can't really do much. We thought it would be great on a rainy day, but so did everybody else. After standing in line forever to get in, the crowds were such that you could hardly walk around.
We go because it's included in our PAPs, but I probably would not pay to buy an individual ticket. I do enjoy playing a few games of Ms Pacman whenever we go. It brings back my younger days.
Sheila