Mine just so happens to be Half-Life.
It is quite a game. It's an alien shoot-em-up. The first Half-Life game has pathetically poor graphics. Still, it is one of the best in the series. Half-Life 2 is the best one. Unfortunately, after that, Episode One, is not that fun. Not that I'm complaining. Episode Two ends the series pretty well. Even more unfortunately, however, it is not an ending. Half-Life 3 is yet to come out.
So what about the rest of those crazy games I put down I own with the prefix "Half-Life"? One of them was a "deleted scene" from Half-Life 2. Two others are multiplayer games related to Half-Life. A final two are add-ons two the first Half-Life.
I could talk for days about video games. I probably shouldn't. It's unhealthy. My Half-Life Anonymous instructor told me so.