Tell me the Game on which you have spent the most hours on steam. xD

Oh, shit. TF2 with 118.6h then Borderlands with 94.6

^^

Sleeping dogs 13.1 hours (i know i dont play that much :P)

Dota 2-49.0 hrs / 190 hrs

434hrs - TF2

355hrs - Terraria

The rest here.

Garry's Mod 116 hours

Left 4 Dead 2 - 700 hrs.

Borderlands 2 - About 86 hours

Dota 2... I'm sorry. XD

TF2 - 457 hours
Civilization V - 140.5 hours
Napoleon Total War - 91 hours

Binding of Isaac- 109 Hours

my brother - counter strike: source +1000hrs |
me - skyrim +100hrs

CS:GO.....330hrs

I haven't had much time to play lately, but currently I have most play time clocked on Ys Origin, 36 hours total. I just love that game, I wish I had more time to play it!! I have finished it just with two of the three playable characters and I haven't even tried the boss rush -mode yet. And I have a ton of achievements to unlock to boot. I'll be still spending many hours on that game. ^^

worms reloaded over 800 hrs

300+ hours in Guild Wars and i think Fallout New Vegas is after that

Arma: Operation Arrowhead 188Hrs. Mostly because of DayZ. And i guess the time i was playing via sixlauncher is not counted in that.

DD over 300hrs

Tf2 and Dota 2

Team Fortress 2

223 hours in Recettear. Maybe I'll get back to it someday to get 100% items.

Counter-Strike - 1053 hours

TF2 - 1404 hours (some of that is idling)

Mass Effect 2 with 412.6 hours, closely followed by Dragon Age Origins Ultimate with 409.5 hours.

Spiral Knights, 46 hours... see the rest here.