Q: I want to play Halo 3 on-line so bad.
A: you need everything first answer said if you want to go wired and your internet connection needs to be highspeed (anything better than dial-up, DSL is what we have) If you want to go wireless then you need 1. a wireless router or a modem that is a router and modem all in one like mine (Westell model 327W also says versalink on the bottom) 2. Xbox wireless adapter that hooks into the USB port on the back of the 360. If you live in US you can get the adapter at Wal-Mart for $87.63.