BZFlag is a free online multiplayer cross-platform open source 3D tank battle game. The name originates from “Battle Zone capture the Flag”. It runs on Irix, Linux, *BSD, Windows, Mac OS X, and many other platforms.
In a game of BZFlag, players drive around tanks, viewed from a first-person view, in a server-defined world (also known as a “map”), which can be modified. Tanks have the ability to drive through other tanks, but cannot travel through buildings or other world objects. The basic objective is to destroy opponents’ tanks, which are tanks of another team’s color. For example, green tanks are supposed to try to destroy red, purple, blue, and rogue tanks. Rogue tanks do not have any allegiances to a certain team and are therefore able to kill anybody.




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