In my opinion, I think this is the best installment in the Doom series. This has an end to things as it is the "final" chapter (duh) to the Doom series, it's so refreshing to play a classic FPS game once again.

What do you get in this masterpiece? Two new episodes, Evilution and The Plutonia Experiment with 32 maps each, 64 maps in total. Complete with its own custom soundtrack, a conclusion to the original Doom story. It is essentially a Doom 3, before Doom 3.

Team TNT and the Casali Brothers did an outstanding job on the maps for both episodes. If you thought that Doom 1 or Doom 2, or even the Master Levels in Doom 2 weren't challenging enough, pick this game up. It's definitely worth your money.

If you want even more of a challenge, play this on Black Metal difficulty in Brutal Doom or Ultimate Complexity (I think that's the name) difficulty on Complex Doom. You won't be disappointed.