Named Game of the Year by over 50 publications, Valve's début title blends action and adventure with award-winning technology to create a frighteningly realistic world where players must think to survive. Also includes an exciting multiplayer mode that allows you to play against friends and enemies around the world.
Very fun and addictive and challenging the only thing I don't really enjoy is the complex puzzles in this game sure shooting down grunts and mowing down aliens is fun but the puzzles are the worst they can offer.
I love this game alot.
I give it a 8.5/10
I'd honestly recommend you buy it.