I used kano's script to install my Radeon drivers in knoppix and kanotix. I'm sure you won't have any problem installing the nVidia drivers.

In knoppix 3.9:
The only way I could play bzflag was using klik.

To use klik, read:
http://klik.berlios.de/ or look in this forum about it

install the game using:
klik://bzflag
klik://bzflag-server

I couldn't use apt-get. don't ask me why, I use kanotix

In kanotix
I used klik, no problems.
You can use apt get in kanotix, but you need to use the keys, etc.