If you ever are wondering if there is a released level editor, then follow these steps.
1) Start at https://www.romhacking.net/
. Then click on Search
in the top right of the menu bar. Then type in the game's title. (Note: if you click on Search while in the forums, then it will only search in the forum topics, which is not what you want).
2) In the search results, look for the game's title or a hack for that game. You will usually find a useful link in the first page of results.
3) If you clicked on a hack or translation for the game, then click on the game's title in the top left corner of that page (this link is located directly below the title screen thumbnail image for that game).
4) The game's main page will have sections listing Documents, Utilities (including level editors), Translations, and Hacks. If there are no items in a category, then the category will not show up.