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.)


No sort or search function?
Unfortunately not. It is sorted chronologically from the time you purchased. To find out the oldest entry, scoll down, click the “more” button and scroll all the way down. I guess this is not a list most people use or need, so there is no need for Valve to invest building further. To find something specific, you can use the browser search functionality
Ctrl+f.I’m a Valve pay pig. That’d probably take me hours.
Not really. You just click “more” once and scroll down. Its a 5 second thing.