What is your most played game in your steam library?

[old reece frost]

Garry's Mod @ 122 Hours, last played Saturday.

[Scottonpc]

CS GO

[rctsquared]

Borderlands 2 followed by F1 2013

[Sei]

non steam game Age of empires 2 with around 1.5k hours  Steam game Kerbal Space program with 208 hours 

[skljom]

does xfire count, over 3k of Call of Duty 2 on me. Played it 6 years

[Grape Guild]

If you count Origin, BF3.  For steam, I used to no life TF2

[dusty594]

The Binding of Isaac. Seemingly endless replayability. Can't wait for rebirth!

[Champion-Craig]

Planetside 2 at around 140 hours, but if Combat Arms was on there, it would be about 300-600 hours+

Planetside 2 for the win

[Worth]

 TF2(I could play it before I got a good PC), but recently AC4 - 20 hours in 2 days or so.

[zxcvbnmmssdh]

 TF2(I could play it before I got a good PC), but recently AC4 - 20 hours in 2 days or so.

Not from Steam, League of Legends, I know that for a fact

[Amanaman83]

Around 270 hours of Kerbal Space Program

[Worth]

Not from Steam, League of Legends, I know that for a fact

Don't know how many hours, but a lot.

[Lil Chillbil]

Far cry 3 at 56 hours, bf3 at 38 hours on origin 

[FireFox]

Mine most played game at the moment is Fallout 3 GOTY that my mate got me, I've clocked around 144 hours so far

[Ritsukashy]

Team Fortress 2 with 2,341 hours on record

[time623]

Not steam, but... Runescape with ~130 days.... Too bad they ruined the past couple years.

[EYCEthebest003]

Crysis 1 by a landslide.  Hundreds and hundreds of hours in that game.  I still love that game, too bad the multiplayer community died a long time ago for that game :\

[tS_kStin]

CoD4 (Don't hurt me I know it is Call of Duty) I have 110 hrs from when I got it on steam (this year) but I had it in physical form from the beginning so it would be over 2000 I think ish maybe but probably more.

[LegendKillerRG]

CounterStrike:Source

[Harvey]

TF2 707 hours.

[That Norwegian Guy]

Natural Selection 2.

 

It would be Morrowind if I had it on Steam... But I have over 4000 hours on MW.

[dushypoo]

Final Fantasy 7

[matin94]

DOTA 2 : 1947 hours

MW2: 246 hours

Arma 2 OA: 100 hours

Battlefield bad company 2: 68 hours

Skyrim: 56 hours

[ccaian]

Left 4 dead 2 

 

Followed by gmod and blops 2.

[Bluuz]

600+ hrs on Creation Kit.