What was your first steam game?

Left 4 Dead 2.

ATI Half-Life 2: Deathmatch / Half-Life 2: Lost Coast Promo

DOTA 2 ,it made me know steam and want to buy other games in steam :)

C.S. 1.6

Dark Messiah of Might and Magic

Fallout New Vegas

CS:GO

L4D

Counter Strike 1.6 anthology pack (because i am a proffesional player of cs 1.6) :D

Half Life 2 that came with CSS and Half Life Source.

The ship :P i still have the box for it :P

Grand Theft Auto Complete Pack

Portal - Complimentary (Opt In)
First one I bought was Valve Complete 2011 Pack

My very, very first Steam game was the CS 1.5 Beta (I think.. it was the one that introduced steam & the riot shield).

The Ship!

Penny Arcade had a cool review for it back in 2006. I guess technically my first Steam game would've been one of the WON keys for a Valve game, but I didn't buy anything via Steam until The Ship.

Steam-wise, I'm a geezer.

First game was Portal which i have yet to finish as my pc couldn't run it at the time and 3rd purchase was Defense Grid Complete pack which is i think the top played game as with only 512mb of onboard video limited on pc games as for the 2nd...yea it is too bad the mention

Now i got too many steam games i doubt i will ever finish them all :/

Super Meat Boy!

Half-Life 2 Collector's Edition.

I bought The Orange Box last year.

HIB 5

CS