use Esrael sonic editor, but it was actually outdated, so if you want to have a sonic editor, there are link:
http://info.sonicret...el_Sonic_Editor
(ESE is extremely outdated, but it fine if you want to use this editor)
If you want to have a new version, use this:
http://vladikcomper....ngStudio_v20.7z
If you want the tools in sonic retro, use this link:
http://info.sonicret...cking_Utilities
You can use new or previous (that is outdated), that you want to edit your levels, but be sure to use ESE FixCheckSum if it corrupt your rom.
images
http://imageshack._us/photo/my-images/7/snapshot12182012305pm.png/