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Doom II: Hell on Earth
Developer	id Software
Publisher	GT Interactive, Virgin Interactive Entertainment Ltd., Activision Publishing, Inc., Tapwave, Inc.
Engine	The Doom engine
Version	1.9
Released	October 10, 1994 October 23, 2002 (GBA)
Genre	First-person shooter
Mode(s)	Single player Multiplayer
Ratings	ELSPA: 18+ ESRB: M ESRB: T (GBA) BBFC: 15 OFLC: MA15+
Platform(s)	PC (DOS, Windows 95, Mac OS), GBA, Tapwave Zodiac
Media	3½" floppy disk, CD-ROM

Doom II: Hell on Earth is a first-person shooter video game created by id Software. It was originally released on the IBM PC on October 10, 1994. It is the sequel to Doom, which was released a year earlier. In 1995, Doom II won the Origins Award for Best Fantasy or Science Fiction Computer Game of 1994. Unlike Doom which was initially only available through shareware and mail order, Doom II was a commercial release sold in stores.

Due to its popularity and success, Doom 2 has been released for numerous platforms, including the Apple Macintosh, Sony Playstation, and Nintendo Gameboy Advance.

Immediately following the events in Doom, the player once again takes the role of the nameless space marine who has proven too tough for the forces of Hell to contain. After being teleported from Phobos, and subsequently fighting on Deimos which is hanging on top of Hell itself, the Marine is back home on Earth, only to find that it too has fallen victim to the hellish invasion.

The player progresses through 30 levels (32 including two secretly accessed levels), and on the way he learns that the remaining survivors of Earth's population are being held on Earth and the only means of escape is the space port with massive ships that can carry the remains of Earth's population into space. However the demons know this and have placed a fire force field over the space port, so that ships cannot land or leave. The marine must battle his way through the infested space port and deactivate that fire force field. Once humanity is finally evacuated from the ravaged, infested planet, the Marine is the only human left on Earth. He sits and waits for death, content in the knowledge that he has saved his species, giving them a chance to continue on elsewhere. Only minutes pass before the Marine receives an off-planet transmission - humans in orbit have managed to find out where the armies of Hell are spilling from. If the Marine can reach this gateway, he can thwart the invasion once and for all.

The Marine wearily pulls himself to his feet and moves off to the portal, cutting a swathe through the demons in his path before finally arriving at the gateway. He sees no way to close it on this side, and so dives through to find a solution on the other side. In the game's own words, "what do you care if you have to go through Hell to get to it?"

After brutal battles with legions of Hell, the Marine finally reaches the home of the "largest demon (he has) ever seen." Once the player fires enough rockets into the exposed brain of the demon, dodging constant attacks from lesser demons the larger one summons, the demon (known as the 'Icon of Sin') explodes, devastating Hell in its death throes. When the chaos finally ceases, Hell is in ruins, the invasion permanently halted. The Marine wipes his brow and begins the long journey home, looking forward to helping to rebuild Earth.

Doom II was not a dramatically different game from its predecessor. There were no major technological developments, no major graphical improvements, and no real changes in fundamental gameplay. The game still consisted of the player negotiating non-linear levels, picking up keys to unlock new areas, and of course shooting down hundreds upon hundreds of monsters. However, due to there being larger and more complicated maps, with larger groups of monsters, the game required higher system specs than the original.

The main additions to the game were the additional monsters available for the player to fight. The new enemies are as follows:

• The Hell Knight.
• The Heavy Weapon Dude. (Chaingunner)
• The Mancubus.
• The Revenant.
• The Arachnotron.
• The Pain Elemental.
• The Arch-Vile.
• The end boss, called the Icon of Sin.

In this screenshot from Doom II: Hell on Earth, the player has just fired the double-barrelled shotgun, killing a chaingun-equipped zombie.

The SS trooper from Wolfenstein 3D appears in the two secret levels, which are throwbacks in design (and music) to the Wolfenstein 3D and Spear of Destiny games. Also, a hanged Commander Keen figure makes a cameo in the second secret level.

The only new weapon addition was the double-barreled shotgun, which could fire out 20 pellets instead of the regular shotgun's seven, making it very useful in dispatching Demons, Cacodemons, and any form of medium-sized monster.

There was also one new item created: the Megasphere, a tan sphere that could give the player 200% armor and health.

A small change in gameplay was instituted. Instead of the player playing through three related episodes, gameplay takes place over one giant episode, albeit there are interludes for when the story develops. Instead of watching the player's progress on a map (as in the original episodes of Doom), the screens between each level simply show a background. It also meant that the player would not have to start over with a pistol every eight or nine levels (as was the case in Doom, since each episode consisted of nine levels, including bonus levels).

The level design, much like in Doom, was supposed to mimic the areas the player was going into. Now that the game was taking place on Earth, a real-world look was attempted, with some levels taking place in certain kinds of military installations, and others taking place in residential areas. Some areas do resemble places on Earth (like Downtown), but most simply seem strange due to engine limitations. Eventually level designs no longer attempt to appear realistic, but by then the player has left the normal non-warped Earth. (After level 21, the skies are crimson red with mountains, unlike previous levels which had apartment buildings.)

In general, Doom II was well-received and went on to sell 2 million copies, making it the highest-selling id Software game to date.

Elements from the game would be used in Final Doom.

• Level credits: "Doom Credits" (last updated 7 January, 1998, retrieved 27 October, 2004) by John Romero, available as part of the archived copy of Lee Killough's Doom pages on Romero's website.

Official product websites

• Doom II at id Software's official website
• Doom at Activision's official website

Databases

• Doom II at the Internet Movie Database
• Doom II at MobyGames
• Doom II (PC) at GameFAQs

Fan sites

• ClassicDoom.com - Portal covering Doom games on many gaming platforms
• The Doom Wiki - Wiki-based Doom knowledge base
• Doomworld - A community-driven portal with news and resources
• NewDoom - Another portal
• OldDoom - General information, guides, and resources for Doom and Doom II.
• Doomworld's web interface to the idgames FTP archive
• The Page of Doom - a website with information about the game and its history
• PlanetDOOM