First Steam purchase?

Mine was Arma 2: Combined Operations and I bought it so I could play DayZ.

The first game was Half-Life, I had the WON version before but since steam was quite the new thing I bought it there, anyway there wasn't many options back then on steam XD

I believe that the first game i ever purchased on steam was garrysmod and then counter strike source soon after

My first Steam purchase Rainbow Six Siege, 3 years ago. I like this game, changed my life!

It was Garry's Mod and Counter Strike Source. Its was pack 2 in 1.

Hm, not sure. I thought it was Arma 3 as this has brought me to steam but weirdly it doesn't show in my history.
So, from purchase history alone it would be a Star Wars game Collection.

I believe mine was Cities: Skylines. Amazing game, changed my life, love it

TF2 premium and 20 euro to spend in mann co store (yes I was dumb xD)

My first steam purchase was counter strike 1.6. This is single purchase on my steam

my first steam purchase was Counter Strike and after that CSS