Osu!
The history of osu! started all the way back in 2007 when Dean ''Peppy'' Herbert made Osu! as a concept originally called ouentest. He made this game in a all-nighter + some extra hours and the first version got released on July 1st, 2007 to some of Peppy's friends. pUpdater was then later introduced to update osu! to the latest version. Osu! also introduced a ranking system which depending on your accuracy and misses what rank you would get, the choices were S, A, B, C and D.