How about rich, colorful, arcadelike atmospheres?
How about...retro Sci Fi?
Then you know what that means, folks...
Creating the perfect marriage between Quake and Unreal Tournament, between retro sci-fi and futuristic tech, and between casual gamer and advanced expert, and wrapped up in a package with quality that could rival that of commercial games, Alien Arena will send you to arenas never before fought on, strange new weapons with unique features, and against opponents that are out of this world - literally speaking, of course. If you have imagined giving those Martians from Mars Attacks! their plasma-based just desserts or jumping into the eternal depths of space, guns blazin' in the battlefields of yesterday's Worlds of Tomorrow, then imagine no more. From DeathMatch to All Out Assault (DM with vehicles), Capture the Flag to Team Core Assault, no 2 battle's the same - and no 2 aliens will be spared from a few well-placed Rockets (heheheh...).
Being a fast, fun and free FPS for Windows, Mac and Linux, all you need to do is download the game, install wherever you like it, and get your frag on. Oh - and as for the game? Right here at http://icculus.org/alienarena/rpa/.
Overall, a highly recommended FPS game for all the Retro Sci-Fi - and hardcore FPS Action - fans out here.