Your First Steam Purchase

Terraria. Back then it updated frequently and I was tried of having to find a new cracked version for each patch (and also tired of waiting for someone to actually crack it). The second game I bought was The Binding of Isaac, for the same reason (I bought on the day of the massive Halloween update).

Half Life: Blue Shift :)

Penumbra: Black Plague Gold Edition, $9.99.

Home and FTL at the same time but before that I survived off of just free games.

Deus Ex: Human Revolution (bought it with full price 1,5 weeks before Christmas Sale... uhm)

Actually mine was the reverse. I've bought half life boxed pack, and I needed to install Steam to install them.

2 May 2009 Garry's Mod + Counter-Strike: Source Purchase 24,99€

Left 4 Dead 2, October 26th, 2012.

call of duty: black ops, at the time i was really into the FPS game genre, it was the reason i got steam in the first place

Dota 2 treasure key xd
Later dlc quest and hotline miami

Nothing yet.

Garry's Mod, Near the end of 2013

TF2

I used to play Day Of Defeat before existing Steam so when Steam started to work i redeemed my Half Life 1 CD key and obtained Half Life Platinum Pack (Half Life, Counter Strike, Day Of Defeat, Ricochet, HL Opposing Force, HL Blue Shift and Team Fortress Classic)... more than 10 years using Steam!

Magicka

My dad bought me Half-Life for my birthday in 2005. I decided to activate it on the Steam and voila!

My first buy is "The Orange Box" [Half-Life 2 + Episode One + Episode 2 + Lost Coast + Portal + Team Fortress 2] in 2012.

Portal.

Company of Heroes + Opposing Fronts

Counter Strike: Source :D :J

Counter Strike: Source :D :J

CS:GO

First steam game was Portal for free
first ACTUAL purchase was Portal 2

Fortix :)

HL2 original 5cd edition back in 2003