Back in the Amiga days I felt left out of the Doom-type games scene. Then Team 17 released Alien Breed 3D. I spent many hours playing that. The graphics were very basic, but the action was pretty good. Unlike Doom there was no option to save during a level. Instead you got a very long code at the end. I think I did most of the levels. Later I played Doom on the Amiga, but by then it had been souped up to a mighty 33MHz 68040 and 32MB.
Meanwhile, the kids have been playing PlanetPenguin Racer. It's basically just a penguin sliding down an icy hill, but the graphics are pretty good and there are loads of courses to play. This is based on Tux Racer which I tried on previous Linux systems, but I don't think I ever got it fully working. On Ubuntu it was a matter of installing the NVidia driver to make better use of my hardware. Just about everything I have installed on Ubuntu has been a matter of selecting packages from their repositories and most things have just worked. For things like the Doom ports I've had to locate the program files myself to run them as they do not appear in the menu.