Super Soaker Collector / Administrator
BTW: yesterday I was told that a friend of mine bought himself a XBox360. Now, are the Arena multiplayer maps only available over the internet or are they also accessible when playing WLAN against another XBox?
Probably just playable through XBox Live. If you both have XBox Live (Gold) Accounts, you can play in the same room with each other if you're both connected to the internet.