get Metroid Prime Trilogy. It's out now, and it will last 60 hours easily. The problem is that it costs $50 and you said "I have $0. I'm not going to start saving up until I definitely know what I want." So by the time you get the $50 it can be christmas already.
My second option is Mario and Luigi: Bowser's Inside Story, its and RPG and its cheaper, so it can last you enough and its easier to save for it.







