DOOM Classic is now available on Apple's App Store.
From id Software
As a space marine stationed on the planet Mars, you are all that stands between the armies of Hell and their invasion of planet Earth! Choose from customizable control schemes, all designed by id Software co-founder and industry legend, John Carmack. Wield unforgettable weapons like the Chainsaw and the BFG 9000 while fighting through notorious monsters like the Imp, Cacodemon and Hell Knight!
DOOM Classic includes the original three episodes as well as Episode Four, Thy Flesh Consumed, spread across 36 levels of non-stop carnage and action. Also in DOOM Classic, multiplayer action is reborn! With a wireless connection, battle up to four players in Deathmatch mode, or work together cooperatively and fight back against the demons of Hell.