Half-Life 2 has received a 20th year update from Valve! AND IT'S FREE TO GET. The first game? DIRT CHEAP.
If you're not sure where to start because you don't play FPSs, start here. If you do, GET THE GAMES FOR FREE TO DIRT CHEAP HERE.
This is not the Valve we once knew, ever quiet, never sentimental, forgotten Half-Life in the annals of their history and moving onto other things. They have released a full fledged documentary, countless quality of life updates, and thank god they bundled the episodes with it, never again can somebody accidently start with Episode One. You just say, "Play Half-Life 1 and 2" and you're done. Do yourself a favor. Experience these games if you never have before. That's all for now, I'm going to go enjoy the update, play the game, watch the documentary and who knows what else.