Click the green flag and wait a moment. What's to learn about this short project? Notice that the cat appears from behind a separating wall between two rooms. This is achieved by first, saving the backdrop image to your computer. Next you bring the saved image in as a sprite and edit-out part of the image. How that is done may take a little more explanation, but it's not difficult (because this image easily lends itself to the method.) See the grass sprite in the in CleverCat project 323581769 The LongGrass is not as easy as the NextRoom, but it uses the same method; export the backdrop image, import the image as a sprite and remove the part you want to be transparent.
©2019 by Seamus O'Neill