MOTHER 4: Pig King Uprising was a cancelled scratch project, and the predecessor to the newer Shadow of the Pig King!
Pig King Uprising (also known as Old MOTHER 4) got further along, roughly 30% of the way through development, however me being demotivated + the project's bad artstyle was to blame.
You can find links to play all the MOTHER 4 demos here: https://sites.google.com/view/mother4pku/play