Half-Life puts you in Black Mesa research facility, an ultra-secret laboratory under government contract, conducting top-secret and extremely volatile experiments with stuff you are not supposed to know about. You are Gordon Freeman, a Black Mesa employee. This morning, as usual, you pit your way to the research facility for a run-of-the-mill experiment. Only this mornings experiment is not quite as ordinary as you thought. Odd things begin to happen as you make your way to one of the Black Mesa test chambers. Even weirder things happen when you start to move the Test Sample towards the antimass-spectrometer. And you aint seen nothing yet. Yes indeed, the experiment went wrong, and someone wants to keep this hush-hush operation a secret. You know what that means; you will have to fight your way through to the top of the Black Mesa complex. Bizarre, alien life forms will make your life harder. A trained marine squad will make it even harder.