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Mania is a new game mode in osu! similar to Beatmania IIDX (as well as various DJ MAX, Guitar Hero and other rhythm games that require more than 3 buttons) in which a player needs to press the specific buttons for the beat notes that are coming down. It is somewhat similar to Taiko (2), but with more buttons to press and notes moving downward rather than moving horizontally to the left.
osu!mania was released in 08.10.2012.