"Monsters" was issued in April 2001 as the album's lead single, which debuted at No. 15, and is the group's highest charting single. O'Donnell, Creswell and Mathieson described the track's sound, "It begins with purpose, shadowed by a hint of trepidation, but two lines in, as the bass starts to make its point and Dempsey's voice becomes more pointed, the song starts to summon self-belief." Fellow Australian music journalist, Ed Nimmervoll, felt the group had "spent more time on their songs than they'd ever spent in the past. On record the result was the rich and full sound which they haven't been able to capture up until now. Their efforts were rewarded and the band's status confirmed with the first single 'Monsters' becoming the band's first bona fide 'hit'." It was followed by two more singles, "Three Dimensions" (August) and "Twenty Years" (November), which reached the top 50.