It's 100MB big and contains 4 maps,
There's a demo for Windows and a demo and server for Linux
Differences with Full game :
Textures in the full game are, on average, 2X higher resolution than in the demo. The textures in the demo were reduced because of download size limitations. The full game includes over 30 maps, compared to the 4 in the demo. The full game includes over 50 characters, versus 4 in the demo. The demo only supports "instant action" mode, Internet and LAN play. The full version also contains the single-player ladder, enabling you to play through the game while managing a team roster. The demo doesn't include the Unreal editor and content-creation tools which ship with the final game, enabling you to build new levels, modify existing ones, and create game mods. The full version includes 6 mutators offering new variations on gameplay, versus 2 in the demo.
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