Katkoi

Katkoi is the second song credited to M2U in Pump It Up, following Nemesis. M2U handles the composition, while TPW provides the lyrics and lead vocals, with additional female vocals by MYULEE. The track is fast-paced trance-core built around screaming-style vocals, in the same vein as other works by the composer such as March of Fear (from BEATCRAFT CYCLON) and Trouble (from HIGH5). PIU uses a cut-down version of the lyrics.

The BGA, created by Felnya, is probably the most criticized part of the song. As with much of this artist's work, the heavy use of primary and fluorescent colors badly hurts note readability, and the shaky character art together with staging widely seen as childish only deepen the negative reception. The main character is named Zeronia, and the Zeronias here are often described as a copy of the one that appears in Doin's Removable Disk0.

In PHOENIX, Katkoi offers Single charts at levels 8, 11, 14, 18, and 22, plus Double at 12, 15, 19, and 24. The S8 leans on jumps and bursts of repeated notes; it sat at 7 through XX but was bumped up partly because of its dense simultaneous hits. The S11 likewise climbed from 10 to 11 in PHOENIX. The S14 carries roughly 600 notes and packs heavy drills onto a level-10 framework. The S18 layers in even more drills and twists, plus a low-speed section. On the Double side, the D19 stands out for its sixteenth-note runs and trills delivered with positional movement, making minor misses easy. Many of the charts were designed by CONRAD, with the S22 by GGWANG and the Double charts by UYAB. There is also a Quest Zone-exclusive chart, a D21 subtitled "KatNimgo," added in the Prime 2 1.09.0 patch.