It is medium sized and best for 2 to 6 players. Chicago is fun for 3 to 8 players. Water is the most spacious and is good for 3 to 8 players. The teleporters keep things interesting because you never know when some one will appear. Each environment gets harder.
Ocean is the last and it is difficult.
A player must battle jets, helicopters, boat tanks and guided nuclear warheads above water. Below water there are subs and minisubs plus the errant missiles from the jets above.