Name: Extreme Tux Racer
Description: Extreme Tux Racer (ETRacer or ETR for short) is a downhill racing game featuring Tux, the Linux Penguin. It is a free, open source game.
It already runs off my flash drive fine in normal version, but I'm not sure if it leaves settings behind or not.
[Moved to request apps forum, mod SL]
but i think its just called tux racer.
Since it doesn't save your progress, I didn't like it.
But it works fine and doesn't write to the harddrive as far as i'm know. Its already portable (just not in PA format).