Sonic Racing Shift Up

Sonic Racing Shift Up (ソニックレーシング SHIFT UP) is a mobile phone game released as part of the Sonic Cafe service offered by Sega. In this game, the player has to shift gears in a kart as quickly as possible - but get timing right at the same time. Shift data can be uploaded to and downloaded from a remote server so that it is possible to play against people all over Japan. The player can also use earnt Rings to tune their karts up and make them faster.