For me it was Terraria, Satisfactory, Tetris Effect Master Mode, Minecraft with Mekanism mod & CSGO / CS2 (almost 2000 hours in CS alone).
Edit: There are so many answers that I might only reply if I have something interesting to say. I will read all of your answers though. 🙂
The worst for me was elder scrolls: oblivion. I played it on xbox back when it came out. I played nothing else for about 18 months. I must have had thousands of hours by the time it got old.
Morrowind for me.
Dammit I meant Morrowind! I’m getting old.