Interference

Introduced in Pump It Up 2011 FIESTA EX, Doin's "Interference" is most likely the first drum and bass piece to land in the series. The formula is a fast drum beat at 180 BPM with a taut, anxious piano line laid over the top. Together with "Allegro Con Fuoco," it stood out as one of the best-loved EX newcomers. The catch is that its fame never matched its chart count: with so few official charts, the community embraced it as a recurring canvas for custom work.

The S12 sits alongside "Destination" as a go-to chart for learning the hip twist. It works for newcomers, but the twists that kick in around the 300 combo mark are surprisingly demanding: near combos 368-372 and 401-404 you alternate two red notes with the center panel and immediately chain into a "Y" twist that drains stamina and feeds Bad and Miss judgments. The S18 pairs short 8- and 16-beat bursts early with a long run down the stretch; it has few twists mixed in, making it a solid level 18 entry point if your feet are quick. The D13 spreads the S12 into Double while piling on weight-shift work. The D19 mirrors the S18's rhythm and, being fairly tame, was branded an overrated chart (mul-lep): it was demoted to D18 in XX before being restored to D19. The D22, unlocked via the Prime 1.05 update, ramps up steadily into a brutal closing run of chained twists; it was top-tier at level 21 and XX bumped it to 22.

The Full Song S19 is essentially the arcade S18 played through twice, with traps and speed changes tucked inside. In PHOENIX it was raised to level 19 and those speed changes were removed, though an unannounced 17-combo long note still pops up at the very end, which left its reputation lukewarm. The D16 is built around weight shifts, with low-speed stretches that just ask you to ride the beat, apart from a brief foot tangle near combo 600; PHOENIX raised it to 16. The D18 is both long and capped by a closing burst that blocks any Break On attempt, making it one of the toughest level 18 charts, close to D19 territory.