Geometry Dash, 390 hours. I play a variety of games though, I don’t really stick to just one.

final fantasy xiv 4085 hours

Singleplayer game : Cyberpunk 2077 400 hours

Multiplayer game : Apex Legends 2k

Cuphead

13 hours or so and then my laptop died.
I do have a new one now, but I also have another 500+ games to play on various platforms.

Fallout 4 - 1,392.2 Hours.

for actual games, witcher 3 at 220 hours.

for anything in steam at all, it would be steamvr with roughly 5k hours.

Skyrim

Saint Seiya: Soldiers’ Soul. Many hours of online play and +800 total.

Rocket League (600 hours) surprisingly; knowing that I haven’t played it in years…