There is not much to specify for the question, its really simple: Which title is the first game you have purchased on Steam? Was it a good decision? How much did you pay? When was it and what device? You don’t have to answer all questions, this is just a fun discussion to have.
You can check your history: https://store.steampowered.com/account/history/ Edit: Some in the comments pointed out that the purchase history doesn’t go back all to the beginnings of Steam. So if you purchased something earlier, it won’t be listed on your account.
(I reply with my game too.)
The Talos Principle. That was in 2016, when I created my Steam account. It was also the first game I bought legally. I will now proceed to install it on my Steam Deck.
Great game, I never finished it. Got stuck on some puzzle after completing 50-100+.
I really loved the narrator and minimal storytelling in that game. It had a strange sense of religion, math, technology, and mystery.
Like portal, but with absolute severity and no jokes.
I may try it again myself. I had a fun time.