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Rip-Off is a vector shoot 'em up 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 onto the field and attempt to drag the canisters off the edge of the screen. Enemies can be defeated by shooting or colliding with them. The game speed and difficulty increase with each successive wave until all the canisters have been taken ("ripped off"). ==Gameplay== One or two players attempt to protect fuel canisters from groups of invading pirate tanks that appear from the edges of the screen. There are six styles of pirate tanks in the game worth 10 to 60 points each. The value of each style is determined by its speed and strategy. Low point value tanks are very slow and generally head directly for the fuel. Higher point tanks are much faster and may work together to lure a player to destruction. Higher-level pirate tanks are armed with short-range lasers, while player tanks (at all levels) are equipped with a cannon. Invading tanks are destroyed when they are hit by a cannon shot or by a collision with a player's tank. There is no penalty to the player for destroying enemy tanks this way except for the brief period of time he is out of the game. When playing a two-player game, it is not possible to shoot the other player, although you will both be destroyed if your tanks collide. The game is organized into waves and bonus levels. Two or three enemy tanks attack in each wave. A wave ends when all the pirate tanks have either been destroyed by the players or have dragged a fuel canister off the screen. After a number of waves, the bonus level increases 10, 20 etc. and another round begins, starting with 10-point tanks. Each successive round is slightly faster and harder than the one before it. The bonus level gives additional points for each enemy tank destroyed. The game proceeds in this manner until all fuel canisters have been "ripped off" by the pirate tanks. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Rip-Off」の詳細全文を読む スポンサード リンク
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