Use the arrow keys to scroll around. It takes my computer about 10-20 seconds to load, but it might take longer depending on yours. If it takes too long to load go inside the code and edit the map size lol.
This engine can be used to make MASSIVE tile worlds. The current map is one 250,000 tiles large. The program stores the map in lists, and only uses the portion of the list that it needs, so its only processing 130 tiles at any given moment, so it can theoretically run any size map. The limitation is that it takes time to generate the worlds. But I don't see you ever needing a map so large that it would take too long to realistically generate. To use, just copy the scripts inside the first sprite into your backpack. The only things you need to edit are the size of your map, the costume for your tiles, and the algorithm that assigns costumes to coordinates. Just give credit, please! I don't know how to stop the right and bottom edges from dragging the tiles, so you may also need to use the dreaded black border to hide that. If you find a way to fix that please let me know.