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Codex suggestions

Corrections, sources, new sections and drills for the Codex, reviewed against its evidence standards. Website ideas and bugs live in website suggestions.

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Suggest a changeA correction, a source, a new section or a drill.
Checked against the evidenceAgainst the osu! wiki, the game's formulas, studies and named sources, each rated by tier.
Written inWorded to match what the evidence supports; disagreements stay visible.
Released, with creditIn the Codex's version history, credited to you.

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