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.)
Race: the WTCC Game was my first Steam game, I’ve bought a CD of the game and it came with a Steam key. I’ve pretty much forgotten about it until I heard of this new game called Portal 2 and it needs a Steam account to buy. Tried registering and whoops, you already have an account on this email.
The game itself currently cannot be purchased on its own , the bundle the game’s included costs 40$ which i don’t think is worth just for that game.
Currently I have 250 games bought and 700ish more with Family Share.