counterstrike help thnx

a bunch of my friend play counterstrike. i wanna play with them but iunno where to get it. does anyone know? i don't think they payed for it either. i think they downloaded it. thank you for the help

Replying to #3

and yes, no warez and such ;)
Justice sucks sometimes but it's for the sake of mankind.......................and cookies

my bad for breaking any rules. also i did google cs. most of them tell me to buy it. you obviously weren't paying attention when you googled it lol