Counter-Strike: Source

That crackhouse map had me hooked for years.

L4D2, 3000 hours. Multiplayer is fun both playing as a solo and playing with groups and the custom mapping community is a treasure trove.

Maybe Final Fantasy 11 Online, MMO's are big timesink. Maybe Rome Total War, GTA4 & 5. Kinda hard to say some games don't keep track of playtime like steam does now.

fortnite

Probably Half Life 1 or 2 deathmatch.

Garry's Mod, 2700h.
The last ~300-400h coming from mapping.

steam says dota 2 but it's very inaccurate.

everquest is probably my most played game. i played it and liked it a lot as a kid but as an adult it was a game I could turn to when i was stranded in the middle of the countryside living with family and my schizophrenia was too much to work or even drive.

Call of duty black ops 6, i played it a lot with a friend - 318.8 hours

Skyrim and Gta are the next ones in order

Marvel Rivals ~1300 hrs
I have never played a game this much ever in my life because I like third person games and I like marvel.

World of Warcraft. My main character was one of many, and he had over 400 days played. I didn't have much else to do at that time.

Counter Strike

Somewhere between GTA Online and Ark Survival Evolved.

Elite Dangerous . I've put like 3000+ hours into it since 1.0 in 2014.
Why? I like space sims.

Killing Floor (original) - 3,200+ hours. At the time, one of the best co-op games available, I was also making a HoE (Hell on Earth) guide for other players that were struggling to find a team for the achievements, at least they could attempt solo if nobody else joined the server.

i dont know which is mine? i like lots of games but dont have one i obsess over.

at least i dont think i do.