extreme-tuxracer : High speed arctic racing game based on Tux Racer ( http://extremetuxracer.sourceforge.net/ )
supertuxkart : A kart racing game starring Tux, the linux penguin (TuxKart fork) ( https://supertuxkart.net/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a dev1990-overlay
For Paludis use this rsync : rsync://gentoo.zugaina.org/dev1990-overlay-portage
If you have a problem : ycarus(-at-)zugaina.org