Chronology
Each official Nine Inch Nails release is chronologically ordered with a sequential number prefixed by the word "Halo". For example, the fifth Nine Inch Nails release, Broken, is identified with the phrase "Halo Five". These numbers are sometimes modified for alternate versions of a release, such as the multiple releases of The Downward Spiral. Promotional-only releases do not have their own numbers, although the promotional singles for "Piggy" and "Hurt" were both labeled as "Halo Ten," a title later officially used for Further Down the Spiral. A U.S. promo for "Into the Void" is mislabeled as Halo 16 because this number actually belongs to the Things Falling Apart remix album.
- Pretty Hate Machine era (1989–1990)
- Halo 1: "Down in It" (1989)
- Halo 2: Pretty Hate Machine (1989)
- Halo 2R: Pretty Hate Machine: Remastered (2010)
- Halo 3: "Head Like a Hole" (1990)
- Halo 4: "Sin" (1990)
- Broken era (1992–1993)
- Halo 5: Broken (1992)
- Halo 6: Fixed (1992)
- The Downward Spiral era (1994–1997)
- Halo 7: "March of the Pigs" (1994)
- Halo 8: The Downward Spiral (1994)
- Halo 8 DE: The Downward Spiral: Deluxe Edition, reissue
- Halo 8 DVD-A: The Downward Spiral: DualDisc, reissue
- Halo 9: "Closer To God" (1994)
- Halo 10: Further Down the Spiral (1995)
- Halo 10 v2: Further Down the Spiral, European/Australian/Japanese release
- Halo 11: "The Perfect Drug" (1997)
- Halo 12: Closure (1997)
- The Fragile era (1999–2002)
- Halo 13: "The Day the World Went Away" (1999)
- Halo 14: The Fragile (1999)
- Halo 15: "We're in This Together" (1999)
- Halo 16: Things Falling Apart (2000)
- Halo 17: And All That Could Have Been (2002), Limited Edition packaged with Halo 17b
- Halo 17a: And All That Could Have Been, Live CD
- Halo 17b: Still, Limited Edition Bonus CD
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- With Teeth era (2005–2007)
- Halo 18: "The Hand That Feeds" (2005)
- Halo 19: With Teeth (2005)
- Halo 19 DVD-A: With Teeth, DualDisc release
- Halo 20: "Only" (2005)
- Halo 21: "Every Day Is Exactly the Same" (2006)
- Halo 22: Beside You in Time (2007)
- Halo 22 HD: Beside You in Time, Live Blu-ray
- Year Zero era (2007)
- Halo 23: "Survivalism"
- Halo 24: Year Zero
- Halo 25: Year Zero Remixed
- Ghosts era (2008)
- Halo 26: Ghosts I–IV, digital download
- Halo 26 CD: Ghosts I–IV, 2× CD
- Halo 26 V: Ghosts I–IV, 4× vinyl
- Halo 26 DE: Ghosts I–IV, Deluxe Edition
- Halo 26 LE: Ghosts I–IV, Ultra-Deluxe Limited Edition
- The Slip era (2008)
- Halo 27: The Slip
- Halo 27 CD-LE: The Slip, Limited Edition CD with bonus DVD
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