Rip-Off is a vector shoot 'em up written by Tim Skelly and released in arcades by Cinematronics in 1980. It is the first shoot 'em up arcade game to feature cooperative gameplay and the first game to exhibit flocking behavior. Rip-Off was ported to the Vectrex home system in 1982.
The objective of Rip-Off is to prevent computer-controlled enemies from stealing eight canisters set in the center of the screen. One or two players control tank-like vehicles while game-controlled "pirate" tanks rush…