Slipknot is the official debut album by Slipknot (Mate.Feed.Kill.Repeat was their first, but was released independently). The album was released on June 29, 1999 by Roadrunner Records. A digipak version was released on March 7, 2000. This was followed by a "clean" version which was left completely uncensored, and contained a note in the booklet claiming censorship as being "the absolute fascism of America". Frail Limb Nursery and Purity were removed as they are based on a crime scene fictional story, and due to copyright infringement, they had to take the songs off the album and replace them with Me Inside. The iTunes version of the album has "Eeyore" listed and downloadable as a separate track. The clean version was released on March 14; the digipak was re-released on August 9.
The genre of the album is often debated. Musically, it combines elements of alternative metal with hardcore and rapcore music.