As we come up on its 10th anniversary, Doom 95 still holds up. Although its graphics and animations are unmistakably dated, the entertainment value remains strong. Doom also still is surprisingly challenging to play. The mix of maze exploration and full-on firepower gets more and more tricky as the levels progress. Hunting for secret rooms and power-ups is also as entertaining as it ever was. The demo version delivers a healthy sampling of levels, monsters, and weapons--more than we could get through machines that are half a decade old. You might want to turn the soundtrack down. Even with minuscule system requirements, Doom stands the test of time.