In the finished Half-Life 2, there's a section where Gordon and Alyx are fighting through City 17 trying to reach Barney, and come to a destroyed bridge. You end up dropping down to the canal before a ...

I’d be willing to bet that most players, actually, know that the piano in Half-Life: Alyx is playable—it’s kind of set up for you to discover that. But did you know it’s also playable with ...