Sweetiex2 is a VOCALOID track by composer Dixie Flatline, featuring Hatsune Miku as the vocal synth. Originally released on Dixie Flatline's 2009 album Fragments, the song was added to the maimai arcade rhythm game at the launch of maimai PLUS on December 13, 2012, making it one of the earliest VOCALOID inclusions in the series. The song is a mid-tempo love pop piece at 125 BPM, with lyrics revolving around the realization of romantic feelings between two close friends, the repeated "Sweetie Sweetie" in the chorus giving the title its "x2" motif. Over the course of maimai's version history, Sweetiex2 has changed genre classifications multiple times: it originally sat in the VARIETY category (maimai PLUS through GreeN), then moved to niconico (GreeN PLUS through ORANGE PLUS), and finally settled into niconico & VOCALOID from PiNK onward. The Master chart has also undergone notable difficulty inflation, starting as a level 9 in maimai PLUS, it rose incrementally through 9+, 10, and 11+ across successive DX versions before settling at its current 12 (12.4) in UNiVERSE PLUS. This long upward revision reflects both the game's evolving difficulty standards and the chart's enduring challenge relative to its era. The Expert chart was designed by 譜面-100号, while the Master chart was crafted by mai-Star, two longtime maimai noters whose work appears across many early VOCALOID tracks in the series.