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. 🙂
Most of them? I have played hundreds of hours of Dysmantle, and before that I played hundreds of hours of Minecraft and before that Raft and before that terraria and before that vulcanoids, and before that …