Algorithm

Source code: roxyEstimator.js Roxy is a synchronous 4-key regular-chain difficulty estimator for osu!mania. It combines a structural strain model with a compact meta calibration head. The structural layer reads the chart directly; the reference layer uses Azusa and Daniel as numeric signals. Sunny is computed only for Azusa reuse and graph support, and is disabled as an independent meta input. Roxy does not call Mixed or Companella, and Azusa remains available as an independent selectable estimator. ...

Source code: azusaEstimator.js 1. Overview Azusa is a multi-stage continuous estimator that takes an osu!mania 4K .osu beatmap file as input and outputs: Field Type Description estDiff string Human-readable RC tier label (e.g. “Alpha mid”) numericDifficulty number Continuous RC value (range $-2 \sim 20$) star number Linear-mapped star rating rawNumericDifficulty number Primary numeric before blend and calibration debug object Full intermediate values for analysis The pipeline consists of 6 stages executed sequentially: ...