Not a bad game once you get used to the contols. Its a rail shooter, but you move along slowly so you dont have much trouble picking up health, ammo and secrets. The monsters get old fast because they use the same few over and over. The graphics and sounds reminds me of Doom 3. Some of the weapons are nice: you get the chaingun, bfg, plasma gun and the infamous double-barrel shotgun, but you can only carry 3 at a time: the machine gun, the shotgun and one of the specialty weapons. The game is short, although there are plenty of challenges to accomplish for added replayability. This game is fun, not too hard or too easy, but it would be great if they took it off the rail, let you use all the weapons and added more levels to make it worth the 5 bucks.