In the current gaming landscape there hardly is one player who enjoys a good first-person-shooter and never heard about Counter-Strike - a truly legendary game of our time.
If you're a modern day kind of player, then you've probably already played Global Offensive (because you can download CS GO free on Steam these days) - the latest version of CStrike that came out in 2013 and gained an insane amount of popularity very fast. The game is by all means a legend and a father of so many modern multiplayers with similar task: to eliminate enemy's forces, but probably not as quite unique as CS is. If you consider yourself a gamer especially the one who enjoys a good First Person Shooter, then you've most likely heard of Counter-Strike while the chances are, you came here to download CS 1.6.