While short . . . the game is worth the price.
The gameplay in the game is astounding, just like Doom III. You are on the edge of your seat the whole time through waiting for some creature to come out and scare you. The story is about a group of Marines who secure a new tomb area, and one of the Marines picks up a object... an object which opens the portal to hell and starts the whole sequence over again. The whole squad gets wiped out, but the Marine who picked up the object survives. You end playing through the variety of levels; from the ruins of the old cicilization, to the mines, and finally to the research facilities. And of course, the last level is in Hell.
The graphics in the game is pure amazing, and if you have a great PC, you'll get the chills from the blood stained corridors and walkways. Everything in this game is at its best from graphical performance. The characters and creatures look superb. The detail put into everything is just Doom style.
The sound in the game is just like the original. The creepy laughs and the same weapons sound the same. Zombies have the same noises and so does the creatures.
There are though new stuff:
[*] New weapons, one in which you can grab the plasma balls enemies throw at you and then you can throw them back. Sweet! Another one is the famous double-barrel shotgun!
[*] A new object in which you can slow down time.
[*] Great new Story-line, although its short, in which you will love.
[*] New Enemies
[*] New Scares!