This is the game that i judge all other 1st person shooters against. At the time the graphics were amazing as were the sound effects (i had a turtle beach sound card in my pc and it was great), the gameplay was awesome and it seemed to take weeks to finish it, which it probably did as i would have been in every room in every area searching for stuff and trying to click (or press E/F) on walls to make them open like you had to do playing Doom or Rise of the Triad or Hexen or any of the other doom clones at the time. Brilliant game.