W0079–0088 is a compilation album released by Gackt on December 19, 2007. It contains eight tracks, which had either previously been used on the soundtracks of the Mobile Suit Zeta Gundam movies or were covers of earlier songs from the Gundam franchise.
WBest of the Best: Mild and Wild are Japanese recording artist Gackt's two separate compilation albums released on July 3, 2013, and include songs released throughout his career, some never performed live and released before on an album.
WThe Eleventh Day: Single Collection is Japanese recording artist Gackt's greatest hits album released on July 21, 2010.
WJūnigatsu no Love Songs ~Complete Box~ is a limited edition box set album released by Gackt on December 13, 2006. It contains nine different versions of the previously released single Jūnigatsu no Love Song, including the Chinese version duet with Leehom Wang, and four new versions. The box set also contained an aromatherapy diffuser and gold & silver foil postcards of the CD covers. It ranked 55th on Oricon's album chart.
Wnine*nine is a limited edition box set of Gackt's video lives released on October 29, 2008. It collects the artist's previous live concerts on 13 CD's. The box also contains a bonus DVD featuring interviews, miniature booklets of all tours, and two unreleased songs; "Justified", and 1997's cover of song "Kizudarake No Lola" by Hideki Saijo. It reached number thirty-four on Oricon.
WThe Seventh Night: Unplugged is a compilation album released by Gackt on May 26, 2004. It contains acoustic arrangements of previously released songs and complements The Sixth Day, a single collection released three months earlier. The unplugged theme of The Seventh Night would be continued by Gackt's subsequent album, Love Letter.
WThe Sixth Day: Single Collection is a compilation album released by Gackt on February 25, 2004. The album collects the artist's previous single's title songs, some of them having been re-recorded for this release. The Sixth Day complements The Seventh Night, an unplugged album released three months later.