Tank Force is a multi-directional shooter arcade game that was released by Namco in 1991. It is the sequel to Battle City, released 6 years earlier, which is a sequel to Tank Battalion, released 11 years earlier than Tank Force. It is sometimes called Tank Battalion Arrangement for the way 2-player simultaneous is available (and up to 4 can play in some versions) and similar graphics to the Arrangements. The gameplay is very much like Tank Battalion except that this time 2-4 players can play simultaneously, there are several types of enemy tank and there are powerups that can be collected to increase your tank's firepower and boost your score. Source: Wikipedia, "Tank Force", available under the CC-BY-SA License.