T.T.
We just had our son's second birthday at The Zone in McKinney. We used the jump area, younger children's arcade and had pizza. We were very impressed with the way it was ran and how it's separate from the rest of the activities, which is great for younger kids!!
If you are considering Planet Pizza remember that some children are scared of the sounds and rides. If it's mostly older kids, then it shouldn't be a problem, but you might find this with the younger ones.