Your Most Played Steam Game

CS:S 100+

Killing Floor - 102.2 hours

Terraria 119 hours

Team Fortress 2, 1800 hours, but I reckon I have around 2200-2500, due to playing before they started tracking.

newbs
Team Fortress 2
3.6 hrs / 3440.8 hrs

1. Counter-Strike: Source 434.1 hrs on record

2. Counter-Strike 374.1 hrs on record

3. Call of Duty: Black Ops - Multiplayer 220.7 hrs on record

4. Grand Theft Auto IV 155.1 hrs on record

5. Killing Floor 127.2 hrs on record

6. Battlefield: Bad Company 2 91.1 hrs on record

7. Fallout: New Vegas 79.3 hrs on record

8. Team Fortress 2 70.3 hrs on record

9. Call of Duty: Modern Warfare 3 - Multiplayer 69 hrs on record

10. Call of Duty: Modern Warfare 2 - Multiplayer 49.4 hrs on record

Garry's Mod
247.1

Left 4 Dead 353 hrs.

TF2 : More than 500 hours.
Then L4D2, CS:S, and GMOD.

counter strike like 500h.

Counter strike : Source almost 1200hours :)

1- Call of Duty Modern Warfare 3

2- Assassin's Creed Revelation

3- Batman Arkham City

4- Sonic Generations

2000 HRS: counter-strike

TF2

Dota 2
377.7 hrs on record
Borderlands
125.4 hrs on record

Borderlands 70 hrs
Red Faction Guerrilla 30 hrs
HL2 DM, Synergy ~24 hrs each
some with 8-15 hrs

Counter-Strike: Source - 814.2 hrs

1. Team Fortress 2
   1168.9 hrs on record (many of hrs are idling)

2. Terraria
   32.1 hrs on record

3. The Elder Scrolls V: Skyrim
   30.8 hrs on record (soon i will pass Terraria)

4. Counter-Strike: Source
   13 hrs on record (Just got it)

5. Alien Swarm
   4.1 hrs on record

Counter-Strike
832.9 hrs on record

My top5
Team Fortress 2 - 735h
Terraria - 95.6h
Counter-Strike: Source - 41.9h
Garry's Mod - 40.4h
Dungeons of Dredmor - 23.5h

Terraria -- over 800 hours, and that doesn't count the version I played before buying the game.

The closest thing to that on Steam is Dungeons of Dredmor, at 70-some hours.

Of course I put probably over 2k hours into the 360 version of Oblivion.

1. Terraria: 178.1 hrs
2. Aliance of Valiant Arms: 80.9 hrs
3. The Elder Scrolls V - Skyrim: 65.2 hrs
4. Eternal Silence: 41.1 hrs
5. Portal 2: 39.6 hrs

Fallout: New Vegas 149.7 hrs

Just Cause 2 77.8 hrs

Borderlands 71.4 hrs

Terraria 70 hrs

Spiral Knights-416 hours

Borderlands
167.5 hrs registradas