Minecraft

The best-selling game of all time (300+ million copies) is also one of the coziest — in Creative mode. No enemies, no hunger bar, no fall damage. Just infinite LEGO in every direction, with a procedurally generated world that goes on forever. Peaceful mode in Survival still has exploration, mining, and building but removes hostile mobs. Minecraft's modding community has created entire cozy sub-genres: cottagecore builds, lo-fi farming, underwater bases with ambient jellyfish. It's been used in therapy, education, and urban planning. The game is whatever you want it to be.