What's your most played game?

Of all-time it's Fiesta Online (MMORPG) or League of Legends, both 2k+ hours, not sure how many thousands exactly. I played with friends for a majority of 'em, which definitely helps make playing it that long enjoyable.

Also I never thought I'd be a vanilla person growing up, yet here I am. (At least when we're talking bout ice cream!) Kid/Teen me would definitely think I'm a boring adult now. :P This realisation hit me the other day when I ate oatmeal cookie ice cream. haha

4K hours (and counting), on Football Manager 2015.

Everquest, though I couldn't say how many hours but I'm sure it was many thousands.

On (and off) Steam, Mabinogi. Otherwise it's D2:LoD & D3:RoS, VtMB & VtMR, Freelancer, SWTOR... not in any particular order. IMO, older games simply has way better replay value.

I've got about 4000 hours in WoW. Haven't played in months though.

1. Dawn of War 1 including Add-Ons : Sth. between 3000h-3500h
2. APB Reloaded: 971h on steam and sth around 250h before. So overall sth around 1150h-1250h
3. Overwatch: 977h together on 2 Accounts
4. Minecraft: Sth between 400h-500h
5. PUBG: 224h

minecraft, probably 4k hours or more. i've been playing since ~2012.
diablo 3 with over 3k hours, lost count after season 10.

on steam, fallout 4 with almost 750 hours. counter strike doesn't count because it was idled. :3

Well.. damn..
On Steam? CS:GO (yea I know, shame on me) with 1.319hours.
In total? hmm.. probably Metin2. Over 4.000hours on the last character I played before I quit. + some characters before and while I had this one.. so probably.. 6.000-8.000hours? Maybe 10.000? A lot of idling or using it as a chatroom though...
Maybe even Crossfire NA (now West). It doesn't has a tracker for playtime, but I am basically actively playing this game since summer 2010 - so idk.

Edit to Metin2: After a recent study (just logged in on the website to check my playtime..) my last character itself is at 5.630hours (or 234Days, 14hours and 38minutes).. damn.

ASTA Online - 706 hours

On Steam should be Borderlands 2 with "only" 100 hrs.
Back in the days I remember playing Morrowind a lot, I mean, I played that for years

Call of Duty 2. Around 1000h according to Xfire

Song of the Deep 23 hours.

Counter-Strike: Global Offensive with 2,128 hrs on record...

After playing the game for a bit, I am pretty confident in saying that it's an ok game

View attached image.

Definitely Ark survival Evolved, ~1K9 hours (lot of afk/guard duty in it tho). This game was dope, few times ago, Pvp was incredible as a team. But dev have gaved up the game balance/fixes/optimization to get money (after they have been bought by a big editor (I'm thinking it's EA but need to double check).) Then exploit, cheaters, dev choices about the gameplay to be crazy/bankable and not balanced (so it would be competitive and not just about spending thousand of hours spamming the "no brain" brand new tools they sold as much as possible) and "get the latest DLC right now or die" policies.
All of these things killed the game. Actual players left, newcomers don't stay. Game Over.

Third longest - Elder Scrolls Online 563h, Subnautica 222h, Fallout New Vegas 218h

TF2 - More than 1400 hours

Counter-Strike: Global Offensive, I have played it for 3,703 hrs, It is one of my favorite game :)

Steam: Counter-Strike: Global Offensive with now 1829 hours, followed by Garry's Mod (380 hours) and Euro Truck Simulator 2 (282 hours).
But I guess I spent more time in GTA V (I have no idea how much I spent in that game since I don't have it via Steam) and also in Minecraft when I was a few years younger.

1469 in R6:Siege

I'm very tempted to say Tetris even though I haven't played it in more than 10 years probably

Rocket League with almost 500 hours. I have played it on and off since December 2015, getting those season rewards. Recently hit Champion, which I'm very proud over considering the low playtime.

CSGO 4500 hours, but i did quit it a few months ago.

Brawlhalla, 1339h

1. Rust - 533h
2. Elder Scrolls Online - 364h
3. Metal Gear Solid V - The Phantom Pain - 245h
4. The Forest - 196h
5. Batman - Arkham Knight - 187h

My most played games on steam are these:

Arma 3: 2621
Ark Survival Evolved: 497
Crusader Kings 2: 453

I still play quite a bit of Arma 3 (I make missions and campaigns for it), and I come back here and there for CK2 when there is a new update/patch and or DLC if I end up buying it. But with Ark I quit playing that quit playing that game quite awhile ago, I think the last time I played it was last year sometime.