There are so many good single player games these days though (not by Valve, sadly). If you liked Portal, give the Talos Principle 1 and 2 a try. If you like s

There are so many good single player games these days though (not by Valve, sadly). If you liked Portal, give the Talos Principle 1 and 2 a try. If you like story driven shooters, try Horizons, Control, Atomic Heart, Titanfall, Doom Eternal, the System Shock remake, Metro, Wolfenstein, Dishonored, Prey. There are more good ones from last decade too (FEAR, Rainbow Six, etc.). None of them are really Half Life replacements, but they're good. Or if you don't mind open world, RDR2, Cyberpunk, etc. Not to mention the dozens of amazing single player indie games (not shooters) that have sprung up on Steam over the past two decades. Valve seems to have given up on single-player games, but their marketplace allowed the industry to really blossom into the huge thing it is today.