Let the Obsession begin. Again. This time, the entire forces of the netherworld have overrun Earth. To save her, you must descend into the stygian depths of Hell itself! Battle mightier, nastier, deadlier demons and monsters. Use more powerful weapons. Survive more mind-blowing explosions and more of the bloodiest, fiercest, most awesome blastfest ever! Play DOOM II solo, with two people over a modem, or with up to four players over a LAN (supporting IPX protocol). No matter which way you choose, get ready for adrenaline-pumping, action-packed excitement that's sure to give your heart a real workout.
Doom never gets old and will never get old why ? because killing hordes of hellspawn and zombies is more satisfying than killing Generic modern day military mooks, plus there is a dedicated library of meter-breaking countless wads for lifetime re-playability.
Your copy of Doom can't play on a modern computer ? then sourceports will surely save your day, There are Source ports that caters to purists and old-skoolers(Chocolate Doom and Prboom+) and Source ports for the newer generation (Zdoom , GZDoom and Zandronum).