Sorry to p!ss in your cereal but if you bought the N900 for gaming, you went with the wrong platform. That is, plug'n'play-out-of-the-box kind of stuff is not what the N900 is for. If you are willing to take the more adventurous path, particularly on gaming, do a search on Preenv or a dualboot option with NITDroid (no you can't make phone calls with it yet, everything else works like on an Android phone).

Word of caution though: read the wikis/instruction pages carefully and backup everything with an app called BackupMenu before venturing onto the path less traveled.

Use the power search function on this website, it answers 90% of the questions you may have. Yes, it takes some time to get through the lengthier threads, but in the end it'll be all the more worth it. Have fun!