Half-Life turns 20 today, and it feels more original than ever

There are no collectibles in Half-Life. It’s incredible.
That’s not how I would have praised the groundbreaking first-person shooter, which turns 20 years old today, when I first played it. At that point, I might have described how Half-Life infused sci-fi shooters with a sense of realism. It set an alien invasion in an Earthbound scientific research facility called Black Mesa, where an ordinary man (or at least, an ordinary MIT-trained theoretical physicist) named Gordon Freeman is