Games are a problem. Most games don't run on Linux. Sure, there are some cool games, like TuxRacer, but the real stuff usually doesn't work. Quake3 has a Linux version, and I think Doom3 has, too, but Id Software is pretty much the only company that has Linux versions of their games.
Other games sometimes work, curtesy of the WineX WinAPI + DirectX implementation, but that's often a question of luck, and WineX costs money if I remember correctly.
What's useful to install is the correct OpenGL implementation for your graphics card, otherwise you won't get any proper games. And the ALSA setup is very important; that's what's making your sound work (or not).
Finally, "poly" means many in Greek, not Latin.