The first half of this game was EXCEPTIONAL. The second half of the game was EXCEPTIONALLY disappointing. First off, the FPS gameplay is surprisingly solid for a game of its era. The Enhanced Edition makes it feel even more modern. The plot is great and you can see how this company later went on to make classics such as BioShock, all the elements of the storytelling that the BioShock series does is here, like learning the plot from your surroundings and logs and the such. The first half of the game gets you hooked and is just pure gaming bliss. Unfortunately the second half loses that because of the sheer amount of frustration and having to backtrack when you miss a crucial puzzle (I despise backtracking, unless it is done right, it wasn't here). Also, there was a common game-breaking bug that has not been resolved, well, only game-breaking if you are trying to 100% it like I was. What really put the nail in the coffin for me was the ending. I won't spoil anything, but lets just say the endgame is a massive letdown to an otherwise good game. I would recommend this game for people who like classic FPS like Doom or Wolfenstein 3D, and maybe even those who like the BioShock series who aren't afraid of aged games. I, however, would not recommend this for the general masses, due to all the problems and frustrations I had in the second half.