To really appreciate the Doom 3 series you need to have played the original `Doom' (1993) and `Doom II' (1994) games that knocked peoples socks off back then. You then understand why Doom3 has nothing more than an array of monsters jumping out at you every time you open a door for the first time - it's just a homage to the original games. Game play, the demons, and locations in Doom3 are pretty much as the original Doom series, and as before you mostly just keep killing these very nasty things until there are none left. However in this Doom3 series the graphics quality, AI, and story development are in a different league, and you do have some interaction with other characters and the odd defence spider droid. You need a powerful gaming PC though (we have an Nvidia 7950 graphics card and AMD-2 5000 PC), plus you must own and install the original Doom3 game to run this expansion pack.
The story is set two years after the Doom3 catastrophe at the Union Aerospace Corporation (UAC) research centre on Mars, when Dr. Malcolm Betruger and his team unwittingly unleashed Hell's demons when recreating transporter technology developed by a long gone Martian race. It's 2147 and UAC has detected a strange signal from one of its Martian satellites, and consequently sends a team in to investigate. You go deep into the archaeological ruins of the lost Martian civilisation and find another alien "Artefact". When you touch it, in the first few seconds of the game, the forces of Hell are released again and attempt to steal back the powerful mystical device. You, a marine combat engineer, are working for Dr. Elizabeth McNeil. The attractive Dr McNeil was the whistleblower who notified counsellor Elliot Swann and Jack Campbell of Dr. Malcolm Betruger's mysterious activities at the beginning of Doom 3.
This time there is little introduction, within minutes you are running from cave to lab to monorail blasting demons at a frantic pace. Again the power starts to fail, but this time you find you are using your torch a little less (which almost lightens the tension). Occasionally you have to brave the Martian atmosphere with a respirator, but mostly you are wandering around the decimated dig area and long derelict bases, picking up a few PDA's and data discs left around by the hapless UAC staff. These provide emails, voice recordings and reports that are essential information for your mission, i.e. the weapons locker codes that enable you to kick a lot more Demon b*tt. The fading radio transmission of Dr McNeil, cut scenes of demon attacks and the eerie silence, with occasional loud machine noises from automatically operating plant, add to the creepy game-play, although most of the tension comes from the gloom and darkness. Plus [sadly] again there's no stealth mode, so you can't hide in the shadows - as that's where 'they' lurk. The game has a few levels: e.g. the Erabus dig site, Erabus Labs and Control, The Phobos Labs, and a return to the disintegrating Delta Labs, before you have to descend into Hell itself to face an old foe. You have all the old weapons from Doom 3 plus a neat antique double barrelled shotgun (resurrected from Doom II) and your mysterious alien artefact.
And the game play is again very scary, plus you need a fast gaming PC to respond in time when attacked or it's all over. This time there's far less time-wasting with cut scenes of you chatting to the odd survivor, and the game-play is overall far shorter than Doom3 (which actually reduces the feeling of repetition and works quite well). Again it does get quite hard as you near the end, and I had to resort to health and ammo cheats to survive the battle with the odd demon boss. Here though your alien artefact comes into it's own as it gains power through the game, and becomes quite formidable by the end. It took me just a few days to complete the game (Doom3 took weeks), partly because it's easier to get out of each level. You can save at any time for difficult sequences. So overall, just like Doom3, it was a very enjoyable, if rather creepy, game - it's not for preteens though. The only problem I had running the expansion pack was that I had to unload my patched Doom3 and reload it (unpatched) before Resurrection of Evil, which then applied the update patch - otherwise both games refused to run. For me it ran under XP and now Vista (with 3Gb system memory). So highly recommended, if you have a very fast PC, and now (often) at a bargain price.