What was your first game on steam? GA ended.

Left for dead

portal 1, got it free when steam was giving it out

torchlight 2 4pack

NyxQuest

some indie game that I bought from g2a, didn't even know about bundle sites back then

MW2

Morrowind: GotY Edition

Well my "first game" was a bunch. Discovered Steam at the end of the 2013 Summer Sale... so...

Fowl Space
Chivalry: Medieval Warfare
The Cave
The Walking Dead
Sid Meier's Civilization V: Gold
Dishonored - The Knife Of Dunwall DLC
Dishonored - Void Walkers Arsenal DLC
Dishonored: Dunwall City Trials
Dishonored
Monster Loves You!
The Book of Unwritten Tales: Complete
Amanita Bundle
Puzzler World 2
Puzzler World
Foreign Legion Bundle
Faerie Solitaire
Big Brain Wolf
The Orange Box
Saints Row: The Third - The Full Package
Just Cause
All Zombies Must Die Bundle
Just Cause 2 DLC - Monster Truck
Just Cause 2 DLC - Agency Hovercraft
Just Cause 2 DLC - Chevalier Classic
Just Cause 2 Black Market Boom Pack
Just Cause 2 DLC - Rico's Signature Gun
Just Cause 2 DLC - Bull's Eye Assault Rifle
Just Cause 2 + Prima Official Strategy Guide
Just Cause 2 DLC: Black Market Aerial Pack
Fallout New Vegas Ultimate
Fallout 3 - Game of the Year
Portal 2
Winterbottom
Zombie Driver HD Apocalypse Pack
Zombie Driver HD
Payday: The Heist
Sleeping Dogs DLC Collection
Sleeping Dogs
Alan Wake Bundle
Stacking
Amnesia: The Dark Descent
Reus
Deus Ex Collection
Castle Crashers
Castle Crashers Pink Knight
Castle Crashers Blacksmith
Rock of Ages
Time Gentlemen, Please!
Killing Floor
Tomb Raider: Headshot Reticle
Tomb Raider: Agility Skill
Tomb Raider: Pistol Silencer
Tomb Raider: Hunter Skin
Tomb Raider: Animal Instinct
Tomb Raider: Tomb of Lost Adventurer
Tomb Raider: Pistol Burst
Tomb Raider: Survival Edition
Tropico 4 Collector's Bundle
Bully: Scholarship Edition
Surgeon Simulator

Edit: pricetag was a whopping $225.33 (USD)!!!

1.- Mafia II (Free Key) 26/10/13
2.- Civilization V (Free Key) 26/10/13
3.- Garry's Mod (Steam Store) 03/12/13
4.- FEAR Ultimate Shooter (Free Key) 04/12/13
5.- Left 4 Dead 2 (Free Steam Store) 25/12/13

Imperial Romanum V Gold.

Oh., i remember that day.

Call of Duty: Modern Warfare 3 anyone?

Portal!

For me it was Left 4 Dead. Then I got the Orange Box, then Killing Floor!

Half Life 2 Silver Package whateverthefuck.

doesn't say because my first game was a gift

Mine was Portal 2, and that was back in November 2013. I never properly finished the entire game until last month, mostly because I procrastinated.

Portal 2. I bought it at retail for full price because I had no idea steam was a thing.

It says The Walking Dead was my first, but it was actually Team Fortress 2

Dota 2

Metro 2033, was free, i add it on dec 15 of 2012... now i have almost 6k games on steam :X

Other than the obvious Orange Box and other valve back-games?
Ragdoll Kungfu.
So much fun back in the day, but the servers are dead now, and people learned how to abuse the physics to the point that any match-ups were like masters with dreaded "Touch of Death!" and "Frozen Dragon Palm!" legendary moves. Sadly I don't think I have all the custom skins I made for it, including Aku from Samurai Jack.

Mount and Blade: Warband

I probably had an old account when I bought the Half-Life CD and registered to play CS 1.5. I had no idea on what Steam was about and HL/CS was the only game in it. I don't even remember my username since I used my old yahoo email that doesn't exists anymore. Bummer.

Now, I created my current account to buy Dungeonland. It's F2P now, but back then I wanted to support the brazilian devs,
This was Feb 2013. 3 years later I'm 1,179 games poorer than I was. DAMN YOU GABEN!

First game was trash f2p game Dota 2. The second game another trash game CS. And finally third one is Dragon Age Origins - personally for me it is my first real good game :)