I dont know if something is programmable, but my idea is: You play Minecraft Alpha. An update comes and new Sandstone and Lapis Lazuli Ore is added. But you need to go to a place you havent seen yet and the new content needs to be generated. Thats annoying (I think). So my plugin idea is that the plugin saves EVERY BLOCK YOU HAVE SEEN! Example: .............W W W ...........W.........W D D D W.........W D D D S S S S C C C C S S S S S S S S S S S S S S S S S S S D=Dirt W=Wood C=Cobblestone S=Stone If somebody has started like this and has build a little house so every Stone blocks would be replaced. Example 2: .............W W W ............W.........W D D D W.........W D D D D D S S S S *C*....*C* S S S S S S S S S *S*.....*S* S S S S S If somebody has a mine the blocks of the tunnel (marked with *) will be saved and the rest will be updated. Please reply if thats possible or when somebody starts making this. ~/Maddin/