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[RedDevil]

there's no demo for the matrix CS game.

All I can say is if you liked the CS games before, it's only getting better as the Beta brigade puts out more and more new stuff. There's lots more units available now and some interesting changes in how some things happen such as assaults and hidden shooters.
We're preparing to release a new patch in February (tentative date here so don't hold me liable) as well, with even more changes and fixes that should make most if not all gamers even happier. :)