Hey guys
if you want to play on a singleplayer server with a flat surface that you can build on and Test inventions on then ill give you a tut on how to do this It is as easy as pie.
first download http://dl.dropbox.com/u/21076232/Value%20Meal.zip
then run %appdata%
then open .minecraft
then open Saves
extract the file you downloaded and make a 2nd! copy of this file incase the worlds get destroyed!
then open Value Meal File you downloaded and copy and past all folders inside it into the save File in .minecraft
hope this helps :D it will help you with designing :D
Duskie Told me about this :D<3
Leon