Pinball is a type of arcade game. In pinball, the player tries to score points by manipulating one or more metal balls on a playfield inside a glass-covered case called a pinball machine. The main objective of the game is to score as many points as the player can. Other objectives are to play as long as possible (by earning "extra balls" and keeping the ball in play as long as possible) and to earn free games (known as "replays").