What is the playtime difference between your most played game and second most played game?

Counter-Strike: Global Offensive - 1894 hours
Counter-Strike - 1421 hours

473 hours difference.

326 hours

Europa Universalis IV - 764 hrs on record vs Europa Universalis III - 438 hrs on record

Yep, I call my PC the EU Playing Machine.

The time difference is Somewhat misleading, as I used to play them both without opening the Steam client all the time when I had some techincal issues with Steam on my old PC

First non-EU game? Stellaris, 29 Hours

First Non-Paradox Grand Strategy game, you ask? Don't Starve 26 hrs on record

731 Gta V ~ 154 CSGO
So diffrence is 577

If you accept non Steam games:
At least 2000 hours Civ 4. Maybe 300-ish hours for the 2nd place.
Old one: 100+ hourse Super Mario Kart on the SNES :)

7h
AC Brotherhood (played twice)
AC 4 (played once)

So I nearly played AC 4 as long as it took to complete AC B twice

Unfortunately Steam doesn't measure play time.

Time taken from the family account:
Everyday Genius: SquareLogic ...... 1,374 hrs on record
LEGO® MARVEL Super Heroes ..... 816 hrs on record

So 558 hour difference in gaming + idling time + kid playing time (SquareLogic is my own idling time, LEGO is played by me, my kids and their friends).

On my main account the games with highest recorded times are:
The Secret of Monkey Island: Special Edition ... 58 hrs on record
Defender's Quest: Valley of the Forgotten .......... 46 hrs on record

Of course there are a lot of Steam games that I played before Steam started recording times (and a lot of non-Steam games that I played a lot more than Steam games).

1 . Counter-Strike: Global Offensive

1,829 hrs on record

Counter-Strike

1,658 hrs on record

171 hours difference

Evolve - 1,731 h
Borderlands 2 - 409 h
Don't Starve Together - 293 h

If we can count non-Steam games:

• 12.000 hours or so on World of Warcraft
• 136 hours on Metal Gear Solid V: The Phantom Pain

If we only count Steam games:

• 136 hours on Metal Gear Solid V: The Phantom Pain
• 134 hours on Borderlands 2
• 114 hours on The Witcher 3 (This will pass the other 2 in the future because it isn't fully completed yet)

606hrs HAWKEN
427hrs
179hrs MGSV TPP

Garry's Mod: 1108 hours

Assetto Corsa: 562 hours

1108 - 562 = 546 hours

Rocket League: 803 hours

Day Z: 116 hours

= 687 hours difference.

Holy cow. What a play!

TERA: 380
Skyrim: 309

Difference: 71

CS:GO --> 3221
CSS --> 1937

Counter-Strike Nexon: Zombies 592.0h ¯\_(ツ)_/¯
Second place Tap Heroes with 366.6h (but its idle cause stupid achievment)
So Rocket League with 137.1h

Borderlands - 117 hrs on record
Borderlands 2 - 114 hrs on record

3 Hours difference. I don't know how you people can spend hundreds or even thousands of hours in a single game. I've got too many games to play to devote that many hours to a single one (or couple, or several). Even then, I'd probably get sick of any game long before reaching anywhere near that point.

Technically 3052 hours between CS:S and CS:GO but if we want to be more accurate probably about 1500ish between CS:S actual play time and Killing Floor play time

116 hours.
CS:GO with 228 hours and TF2 with 112 hours.

This will change when I've got the urge to play Skyrim though (which sits in 5th place with only 27 hours of playtime).

Most played game now or in past? The most played game i play right now doesn't come even close yet to some games i've played in past. I don't even play either one of these games anymore.

PlanetSide 2, 1,071 hrs on record
The Binding of Isaac: Rebirth, 202 hrs on record
=
869 hours

11 hours

Euro Truck Simulator 2 - 24 hours
Virtua tennis 4 - 13 hours

Crusader Kings II
925 hrs on record

Football Manager 2009
763 hrs on record

 520.0h (Rocket League)
-406.6h (Carmageddon: Reincarnation)
 ------
 113.4h

I'm going to play RL more for sure =)
I won't play C:R anymore but I will play Carmageddon:Max Damage most likely so much that eventually exceed C:R hours (sometime next year)

Path of Exile 254h

The Binding of Isaac 217h

well the real differrence is about 300+ hours because i prefer playing Path of Exile from its client and i just use steam so that it can read my achievements.