ERRORCODE: 0

The DOIN && SUNNY credit caught fans off guard, since SUNNY is actually the chart designer rather than a composer. Doin himself reportedly remarked that he was hearing the remix for the first time, which points to SUNNY having assembled it independently. Structurally, the first half plays out like the nonstop remix of What are you Doin?, while the latter stretch leans almost entirely on Leakage Voltage and Further in a manner reminiscent of Leather. The BGA earned near-unanimous praise, but many players were left wishing the repetitive Leather-heavy finale had more variety. The ERRORCODE: 0 title card flashes three times, with its presentations nodding to the Iolite Sky opening, the gray-on-white look of Leakage Voltage, and the closing of Further. The BGA also hides easter eggs, including a scannable QR code on a blue screen and a fresh pangram woven into the Iolite Sky section.

On PHOENIX the song carries Single 19, 23, and 25 (all credited to SUNNY) plus Double 24 and 27. The S19 sits at its rated level but offers almost no rest, so poor stamina management can make it feel tough. The S23 hinges on the doublestep stream lifted from the Further section, landing around the difficulty of Fire Noodle Challenge S23. The S25 blends Further S24 and Leather S24 ideas and is regarded as a low-tier S25; according to the designer it was originally an S26-27 monster that was nerfed several times before release. Clearing it unlocks the [XX] SINGLE BOSS BREAKER title. The D24 is physically demanding for its level, while the D27 requires a hefty 40,000 PP to unlock, putting it alongside 1950 and Shub Sothoth as one of PHOENIX's entry-line 27s, with only a small set of clears on the leaderboard.