terpzone has bowling, pool and arcade games. the prices are very reasonable - 4 dollars or so a game of bowling and 5 bucks an hour for a pool table. you can also rent out the entire place for some time, but that's much more expensive.
on the arcade games front, they have the usual suspects, but they also have two extremely awesome DDR machines that have their own following on campus. you can go there to play or just to watch people on the DDR machines looking funny dancing.
they also have table tennis, whcih is the cheapest item there (50 cents a TT ball)