I just found this out and knew others would really find this helpful (if it works for you as it did me).
STEP 1- create a new world and save it, then exit minecraft.
STEP 2- go to the start menu in your computer and type in the search bar %appdata%
STEP 3- click on Roaming, then on .minecraft, and then into saves, where all your previous levels are, if you haven't deleted them from here.
STEP 4- click on the level you want to get back, it would have its original name, not one you renamed it to.
STEP 5- open the region folder in the folder world you want to retrieve, and copy the content and paste it into the new world folder you created in step 1 by making a new world in minecraft. (replacing its region folder content of course.
And your done, in 5 steps. exit this and go back to your world you lost. (i don't think you would still have achievements and stuff).
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yes.
No, only if you delete your .minecraft folder, minecraft isn't 'installed' so you can't uninstall it either, just deleting it from your desktop does the trick, all your worlds will be left alone.
Well there is one way to get into good worlds in Minecraft. Type in a seed.
First you must access .minecraft, a hidden folder in My Documents/Application Data. Go into the saves folder to see all the worlds that are on your computer. Now you copy the worlds you want from your computer, put them on the other computer, and paste them into .minecraft's saves folder.
you can have many mod but say if you have the mc donalds mod installed then you try jammy furniture with it it will crash and minecraft will force close