Absoutely not, you do not need a wireless adapter to play online. You just plug an eternet cable (lookts like a phone cord) from your router or high-speed modem into the 'old 360. In my experience (and I think science backs me up here), you get less lag without using wireless.
If you don't have a laptop then you do. If You do have a laptop, you can use it as a wireless adaptor Which will save you about $100 for some stupid add on. All you need is a ethernet cable, a laptop, and the 360.
If you insist on wireless, yes. If you don't mind using a wired connection (I actually prefer using wired lol) then no. Just plug the ethernet cable included in the 360 set into your modem and you shall do fine :)
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