Source:
https://www.smbxgame.com/forums/viewtopic.php?p=22893#p22893
Author:
docopoper
ReleaseDate:
2014-05-04

Description:
I have created a tool for making large scale edits to levels, allowing you to do things like:

- Move large areas of the level.
- Duplicate large areas of the level.
- Delete large areas of the level.
- Select all objects with a given id / on a given layer.
 -Quickly find the id of whatever is under your selection.
- Resize the window to view larger areas of the level.

Hopefully this should make editing levels much much easier.