Although the previous timing window served players well, some top-tier players wanted a stricter window that would better distinguish their skills. Also, for general players, "Pure Perfect" was really the only way to demonstrate how accurately they could clear a level.

Because of this demand, we’ve added a “Competitive Mode” to introduce new elements that let players dig deeper.

Enabling competitive mode activates options for following features: X-Perfect, X-Score and various customization options related to judgments.

X-Perfect

A new judgement, “X-Perfect(XP)”, will be added within the Perfect window.

• Perfect’s hard shrinking cap is ±25ms. (totaling 50ms, see Timing Window Calculations)
• XPerfect’s timing window is ~±16.6666ms(totaling approx. 33.34ms) or ±12.5 degrees.
• Any inputs outside of XPerfect but falling within Perfect will be displayed as -Perfect (fast) or Perfect+ (late).

X-Accuracy

X-Accuracy have a breaking change of removing autoplay and midspin tiles from being counted since v3.4.0 (r150).

• Pure Perfect (Only XPerfects, -Perfects+ allowed) equals X-Accuracy 100%.
• $\text{X-Acc} \;=\; \frac{ (N_{\text{XP, -P+}} \times 100)

• (N_{\text{EP,\,LP}} \times 75)
• (N_{\text{E!,\,L!}} \times 40)
• (N_{\text{E!!}} \times 20) }{ N_{\text{Total tiles}} } \;\times\; (0.9875*N_\text{C})$

• Autoplay tiles and midspins are not included in the total tile count.

X-Score

Since X-Accuracy is calculated relative to levels’ tile count, we are introducing X-Score so players can compare their scores with a fixed ceiling.

• Max X-Score is $\text{Total tiles}*2$.
• $\text{X-Score} \;=\; (N_{\text{XP}} \times 2)

• (N_{\text{-P+}} \times 1)
• (N_{\text{Others}} \times 0)$

Thoughts of devs…

As you can see, the two scores take different approaches to scoring system. X-Score rewards precision, while X-Accuracy presents a general score with plenty of room to cheese patterns and go unnoticed. (Compared to X-Score, that is.)