In theory, this should be a mathematical constant. However, the reality of BMS creation is messy. Early BMS culture was plagued by "unbalanced" charts where the left hand was assigned significantly denser patterns than the right. When mirrored, these charts could become physically unplayable for a right-handed player, or conversely, trivially easy.
Does anyone have a or current mirror list ? Ideally: iidx bms mirrors verified
For (BMS) mirrors and verified downloads, players typically look for "converts" (official songs ported to the BMS format) or original BMS content. Due to copyright issues, many communities distinguish between "legal" original BMS and "illegal" official IIDX song ports. Verified Mirrors & Downloads In theory, this should be a mathematical constant