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. 🙂
Edit 2: It has become too much for me and I have to disable notifications. Thank you for the massive response and please continue to discuss with everyone here. ❤️ 🫡
I’d say the first one that really got me was Roller Coaster Tycoon when I was a kid. It got to a point where I was playing so much that my dreams were all in isometric grid form. Mostly about park designs, but even other dreams were set in that reality.
After that, it was WoW for my first 3 semesters of college. I didn’t go to class most of the time and got academic suspension for a year. After that I was very cautious with MMOrpgs. Never got too invested into a guild again.