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1 byte removed ,  16:55, 21 February 2009
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There are in fact no official names to these tracks. They are usually referred to either by the level they are initially played to, or by one of two fan created track listings. They can also be referred to by their track number, however, the first audio track being placed on the CD's second track (the first being reserved for the actual game data), this usually leads to confusion.
It is notable that this soundtrack contains a rare occurance of [[http://en.wikipedia.org/wiki/Ambient_music | Ambient music]] composed by Trent Reznor, who is known mostly for Industrial Rock.
A particular weapon in gameplay is the "nailgun" which can be reloaded by collecting ammo boxes with the NIN logo on them.