BZFlag is a free, online multiplayer tank game. Playing freestyle, team battle, capture the flag or rabbit chase, tanks pick up flags that either give special powers or punish them for taking the risk.
For a game that's often considered below-average in the graphics department, BZFlag is an amazingly well-balanced and fun to play game. It's system requirements are, well, 4 megabytes of disk space and 16MB of RAM.
That doesn't matter. It's both free and fun, and you should try it.
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