What was your first steam game?

It was either Team Fortress 2 or Dota 2.

orange box

Terraria - Steam Store

Orange Box or Magicka; I forget which came first. Too lazy to double check.

Mine was l4d2 and Killing floor. I got both for free

Half-Life. Redeemed from retail.

Plants vs Zombies.

Team Fortress 2.

Team Fortress Complete

Counter-strike

Dues Ex:Human Revolution from an AMD video card promotion thingy

threads been made before, but too lazy to link it...

So Portal i bought in store for 10 or 20$ whatever it cost when it came out

edit: found it http://www.steamgifts.com/forum/2EruL/what-is-the-first-store-transaction-entry-on-your-account

Dirt 3

Portal. it was free.

Left 4 Dead 2.

counter strike source

orange box from wal-mart :) true story ..I still have the box

Left 4 Dead Bundle.

Skyrim. :)

kinda surprised no-one else said it.
Portal 2, when I got it for PS3 it came with a steam link and so I signed up for steam.

I remember this thread. Half-Life (1.)

The free Portal. Then I bought the Source Multiplayer Pack from Best Buy. It was technically Counter Strike Source but the code also activated Half Life 2 Deathmatch and Day of Defeat Source.

Day of defeat source and left for dead 2

Half-Life 2

Payday: the Heist

Well it's the first one I bought.