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Essentially ScoreSaber allows any custom song to be to be uploaded to the leaderboards, every song has their own unique identifier based on the way it's created this means that if a custom song is modified in anyway, a brand new leaderboard will be created for that song if somebody plays it and uploads their score
ScoreSaber allows any custom song to be uploaded to the leaderboards, Each custom song has their own unique MD5 generated by hashing together all of the difficulties json together, this means if any of the json files are modified in the slightest the MD5 will be different, so mappers, when testing your maps please disable the ScoreSaber plugin, thank you :)