Moved by Linux, fuelled by Half-Life.
Heck, this game was awarded the Game of the Decade 8 years after it's release!!
'Nuff said....
An eternal classic for a reason, no matter in which year you play this game, it will give you tons of fun for a lot of hours just to finish the single player mode....
I was not a fan of FPS before playing this game, but this totally made me a fan of the genre, so if you are already a fan, YOU MUST. PLAY. THIS GAME!