Dan: Project Rip Course • Osu!mania

Dan charts are structured difficulty tiers used in rhythm games to evaluate skill progression. Each dan consists of a set of charts that must be cleared under strict conditions — usually requiring a minimum accuracy (e.g., 96%), with no allowed mods like EZ/NF/HT, no pausing, and no map edits (except mirror).

They help standardize skill measurement, offering players a clear ladder to climb. Higher dans increase difficulty in reading, stamina, control, and consistency. They're widely used in games like osu!mania and BMS, with community-made packs often featuring custom names and difficulty scaling (e.g., Beta, Gamma, Epsilon, etc.).

Pros: structured skill testing, progression clarity
Cons: can favor specific skillsets, difficulty balance varies across packs

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