Modifying in Sandbox

Java Script struggles… I have my students working in the sandbox with the Endless Runner game. They are following the Customization Tips document. When my students try and change the sprite, they keep getting a black box that drops down the screen and disappears. Not sure how to help them. What are they doing wrong? Please help.

Hi Cindi,

Thank you for reaching out! We apologize for the delayed response. Could you please share one of your student’s sandboxes so we can go through it and see the output on their end? By the way, you could reach out through our support email at