From the Super Mario Wiki
Batting Practice is a WarioWare: Twisted! souvenir, which can be found in the Games section. In this game, the player controls both a bat and a pitching machine. After setting the speed of the pitch with , the pitching machine will launch a baseball. The player then has to swing the bat with . The speed with which the bat is swung affects directly the length of the hit. A "Home Run!" announcement will be heard if the player manages to hit a home run. After five pitches, the total length of each hit is added and the game ends.