My friends saved games disappeared and we're not sure why. He had just gotten onto MineCraft and went to single-player, and all his saved games were gone. He hadn't done anything to them and I'm wondering if theres anyway to get his worlds back.
Thanks,
~AquaEye
I have the same exact problem. I use Dr.Zhark's Mo Creatures Mod. What I think happened was that while I was saving, it crashed and not all the chunks saved either. So I came back on to see my first world was missing. I opened it up again and saw I wasnt too far from my original area. All my creations were cut in half, while new land was formed over my mines.
if you spawn a new world over the old world that disappeared it will spawn you near your old world but it likly will have stuff deleted in your world and you lose your inventory.
Thanks,
~AquaEye