Gorf is an arcade game released in 1981 by Midway Mfg. Whose name was advertised as an acronym for "Galactic Orbiting Robot Force".
It is a fixed shooter with five distinct levels, the first of which is based on Space Invaders and another on Galaxian. The game makes heavy use of synthesized speech for the Gorfian robot which teases the player, powered by the Votrax speech chip. Gorf allows the player to buy 2 additional lives per quarter before starting the game, for a maximum of 7 lives.
Gorf is a fixed shooter in which the players take control of an unnamed starship from the Interstellar Space Force, capable of moving freely on all directions around the lower third of the screen, in an attempt to prevent the Gorfian Empire from conquering Earth. Gameplay comprises five distinct missions; each mission presents its own distinct playstyle, but the central goal of each is to destroy all enemies. Successfully completing all five missions increases the player's rank, which represents the current difficulty level of the game, and loops back to the first mission. Gameplay continues until the player loses all of their lives.