First Steam purchase?

First game that I ever bought was ARMA 3.

Counter Strike Global Offensive

GMod, because it was the first game I wanted you couldn't actually buy physically.

My first game was Payday 2 lol

Payday 2 lol xD it was fun at that time

The first i buy Counter-Strike: Global Offensive

My first Steam purchase was Whose Your Daddy, later I bought Castle Crushers

My First steam game was a Firefighter game i got it from my dad

Garrys Mod, i was a huge physics nerd as a kid garrys mod was the reason i got into pc gaming.

Half life in about 20 years ago