Layer Manager: this lets you see which layer number a sprite or clone is on. Look inside for more information. Feel free to use it if you like. Not really a playable project. Click Cat / Giga to go a layer forward. Hold space and click Cat / Giga to go a layer backward. Green flag to reset.
Requested by one of my Scratch friends. Another take on layer management in this project: https://scratch.mit.edu/projects/1351997352