Pick up the crowbar of research scientist Gordon Freeman, who finds himself on an alien-infested Earth being picked to the bone, its resources depleted, its populace dwindling. Freeman is thrust into the unenviable role of rescuing the world from the wrong he unleashed back at Black Mesa. And a lot of people, people he cares about, are counting on him.
One of THE best shooters and stories out there. A game that set the bar for those kinds of video games back in its time and the engine still seems to have the best physics I've ever seen. You cannot deny the awesomeness of the Half-Life series unless you've never played it.