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Official osu! documentation and data
A[46] osu! wiki: Overall difficulty (hit windows, rounding rule, notelock, slider head leniency, mod effects). link ↗ A[47] osu! wiki: Approach rate (visibility times, fade-in, mod effects). link ↗ A[48] osu! wiki: Circle size (radius formula, mod effects). link ↗ A[49] osu! wiki: Hard Rock (setting multipliers, map flip). link ↗ A[50] osu! wiki: Hidden. link ↗ A[51] osu! wiki: Unstable rate (definition, results screen, rate-changing mods, lazer change). link ↗ A[52] osu! wiki: osu! judgement system (slider judgements). link ↗ A[53] osu! wiki: Spinner (clearing, bonus score and health on continued spinning, 477 SPM ceiling, Spun Out at 287 SPM, direction changes resetting the spin). link ↗ A[54] osu! wiki: Slider (tick and follow-circle rules). link ↗ A[55] osu! wiki: Lazer feature comparison (slider head and tail changes). link ↗ A[56] osu! wiki: Upgrading to lazer (feature comparison, including built-in tablet area adjustment and difficulty adjustment). link ↗ A[57] osu! wiki: Local offset. link ↗ A[58] osu! wiki: Keyboard bindings (offset keys, Tab and Shift+Tab). link ↗ A[59] osu! wiki: Performance points (skill values, score weighting, update history). link ↗ A[60] osu! wiki: No Fail (score multiplier; miss-based pp penalty since January 2021). link ↗ A[61] osu! global performance rankings (checked 22 September 2026: mrekk, Ivaxa, cryshina, Akolibed, NINERIK, milosz, lifeline, Zylice in the top eight; ferret irl at 24). link ↗ A[63] osu! wiki: Accuracy (accuracy formula). link ↗ A[64] ppy/osu pull request #20963 (UR estimation assuming normally distributed hits). link ↗ A[74] osu! news (January 14, 2021): Performance points updates (No Fail change from a flat 10% to a miss-based penalty). link ↗ A[75] osu! news (July 2021): Performance Points & Star Rating Updates (strain peak weighting; damping of short spikes). link ↗ A[76] ppy/osu-wiki pull request adding the September 2024 Performance Points & Star Rating Updates news post. link ↗ A[77] osu! news (March 6, 2025): Performance Points & Star Rating Updates. link ↗ A[78] osu! news (October 29, 2025): Performance Points & Star Rating Updates. link ↗ A[79] osu! news (July 3, 2026): Performance Points & Star Rating Updates. link ↗ A[80] ppy/osu GitHub wiki: Latency and unlimited frame rates (lazer caps draw and update at 1,000 Hz). link ↗ A[81] ppy/osu issue #8165 (developer comment: lazer runs input on its own thread at about 1,000 Hz, separate from drawing). link ↗ Something wrong with a source, or a better one? Suggest a source or correction — accepted contributions earn 🍪 Cookies.