SKYRIM!

Bad Rats and Secret of The Magic Crystals

No favorite yet :(

top spin 2!

The Binding of Isaac, Terraria and Portal

Right now, Skyrim.

Although Terraria, ClaDun x2 and Dungeons of Dredmor come pretty close as well, having played them for a bit now...and Torchlight II might also be a contender if it ever gets marked at least 50% off during this Winter Sale so I can get it...

sega bass fishing

CS:S :o

I have many!

Left4Dead 1 & 2;
Serious Sam 3: BFE;
The Binding of Isaac;
Legend of Grimrock;
Jamestown;
FTL: Faster Than Light;
Sword & Sorcery EP

Nothing.

FORTIX !

Terraria

For now, Borderlands then Borderlands 2 have my highest playtimes.

Team Fortress 2
You know a game is good when you can play it a lot and make real money from it

Hmmm. I'd have to say a tie between Terraria and Awesomenauts atm.

noitu love 2

Right now It's Saints Row The Third And/Or Castle Crashers

All time probably Bad Company 2. At the moment it's Silent Hunter 3.

Dota 2, Binding of Isaac, thought i played alot of TF2 and Terraria, but i played downloaded terraria for many hours, now i bought it and can't play with anyone on original version..

Portal 2.

Ys: The Oath in Felghana

2-way tie with Black Ops 2 and Ace of Spades

Garry's Mod

CS 1.6 & CS:GO