bzflag

or, the last game in the series of 5 Open Source Games You Should Try. (I think I've been watching too much How I Met Your Mother.....)

The final open source game on the list is one of my favorites. Bzflag is short for Battle Zone Capture The Flag. Battle Zone is a classic video game from Atari about vector graphics tanks blowing each other up. Battle Zone may have been the first FPS game ever. (First first person shooter just sounds wrong somehow...)

In bzflag, you drive around in a tank as part of a team which is determined by your color. You basically blow up the other tanks that are not on your team (ie, everybody else not your color....).

There are different modes of game play which depend on the server that you join. The two most popular are Free For All (FFA) and Capture The Flag (CTF). FFA is how it sounds like. The only objective is to blow up all the tanks not on your team. Simple right?

In CTF, each team has a flag in their base. The objective is to get the enemy team's flag and bring it back to your base. Obviously, they're trying to do the same to your flag.

In addition to all this, there are superflags which are powerups for your tank. For example, there are guided missile superflags, laser superflags, and stealth superflags.

And here of course are the screenshots: