Use arrow keys to move, and X to shoot fireballs when in fire mario (use number keys to use editor [0 to enter the level editor, l to save and load and r to reset levels.] click m to grab your level code, also to add it just make a new row and paste It then click 0 if your not in the level editor and click l and type the level you want to enter aka the number next to it on the list.) I used Griffpatch's tutorial series "tile scrolling platformer" Here is the tutorial and starter project respectively, https://www.youtube.com/playlist?list=PLy4zsTUHwGJIc90UaTKd-wpIH12FCSoLh https://scratch.mit.edu/projects/485855713/ and here are the scripts for ep 16 from him, https://scratch.mit.edu/projects/572484485/ (btw to use semi-solids press Q to activate and deactivate auto arrange tiles.) I plan on adding updates every now and then and if you want to get your suggestion put it in the comments. I Probably won't be able to add all of your suggestions right away but overtime I will add as much as I can. ENJOY!!