Use the arrow keys to move "Player" around. Try not to fall into the "void". You can't jump in the void, so you have to press the green flag to start over again.
Thanks to @griffpatch for the tutorial on youtube. https://www.youtube.com/watch?v=D16hTnDGweo Please remix! Here is Platformer Game #2: https://scratch.mit.edu/projects/608206205/