The majority of the songs were previously released through the band's Facebook page during Ace Thursdays, though some of the tracks on the compilation feature updated production.

[1] "No Good Lover," included on this compilation, was originally meant to be a single from Flowers, but later did not make the cut for the album.

A demo version of "Giving It Up" is featured as a bonus track on the 2015 remastered release of Happy Nation U.S.

[3] The album was released on CD and vinyl worldwide through the band's official website and through digital retailers on 6 March 2015.

[4] In 2019, the collection Greatest Hits from 2008 was repackaged with Hidden Gems instead of the music video DVD and was released as Ace Of Base – Gold.