What this does is that when you create a World in SMBX 1.4's World Editor, you find a Check Box in the World Setting's tab that say's SMB3 World Map. What this Does is it add's a Inventory Bar to your World Map when you press the S key when you are in a Map. So your wondering, How do you get Item's in the Inventory? Well I have a Video here that I made that has a Tutorial on How to Do that. Hope this Help's to people who need to know how to do this for later Project's.
It help's if you watch this in Full Screen...
Original link: https://www.youtube.com/watch?v=_cByuCQXH8g