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. 🙂
Old School Runescape. I have multiple characters, but started from scratch a month ago, already have 250 hours of play time on it.
on rs3 i played a ton during the pandemic, until it became too expensive (in game currency, and as a principle for the bonds) so i just stuck with doing dailies now. I do stick around longer for EVENTS/holidays.