Save This World νMIX is a remixed arrangement of the ending theme from Phantasy Star Portable, the 2008 PSP action role-playing game developed by SEGA. The song carries the original game's credit as artist, listed simply as 「PHANTASY STAR PORTABLE」, rather than a specific composer or vocalist. The νMIX suffix (using the Greek letter nu) denotes this version as a distinct rearrangement created for the rhythm game context, updating the original theme with a fresh instrumental treatment at a steady 143 BPM. The track was introduced to maimai during the GreeN era on August 7, 2013, as part of the game-variety (ゲーム＆バラエティ) category, reflecting its origins in a SEGA-published game. Over the life of the series, Save This World νMIX received multiple level adjustments across versions, from GreeN through BUDDiES+, and expanded to five playable difficulties with the addition of a Re:Master chart on November 3, 2016, during the PiNK+ era. The chart design team includes the pseudonymous 某S氏 (Expert), はっぴー (Master), and しろいろ (Re:Master), each bringing a distinct approach to the song's energetic, action-oriented pacing.