Cirno's Perfect Math Class

Chiruno no Paafekuto Sansuu Kyoushitsu (チルノのパーフェクトさんすう教室) is a song remixed by Camellia (かめりあ) with "⑨⑨⑨ (999) Remix" in D4DJ Groovy Mix.

It was originally derived from Beloved Tomboyish Daughter, theme of from Touhou Project sixth installment, .

Groovy Mix
Note that during the intro section the rail speed will suddenly and dratiscally drop, and be back to normal before entering first chorus.

The player can, during Free Live, pause the chart and adjust the rail speed during the intersection to make the play easier.

Trivia

 * This song holds the highest BPM of the game, taking the spot from Exitium.
 * Combos (notes) for this song are consisted with 999's multiples except for Easy difficulty.
 * Normal as one third (1/3); Hard as two thirds (2/3); Expert equals with the BPM value.