3.5 stars
Location: third floor of Cosmo (floor dedicated to food at the top). When you go up the escalator you should see a lounge-ish area to your left (some chairs, etc.). Walk over there. Then look to your right. You should see a short walkway where the walls are lined with old records and the like. Bam! Secret Pizza entrance.
Pizza: Pizza was a-ok. We got one piece of pepperoni and some sort of sausage and another piece with pepperoni and mushroom. Tasty and thin without being burnt. I can't say this is the best pizza ever (not even close) but a good and (relatively) cheap bite to eat. ("relatively" because it still seemed pricey to me for what it was).
Oh! And they have a Galaga arcade game you can play for 50 cents. Warning! The controller has some serious jamming issues, though!