Move your mouse to move the red ball. There are food of different colors. There are no enemies. This is not multiplayer. Each food you eat increases your mass by 8. Enjoy.
I watched a youtube video and did each step 1 at a time. I did 1 extra step though. I added 1 more extra food. Do you want to make a Agar.io similar to this on Scratch? What this video: https://www.youtube.com/watch?v=8B4IOSTCdR4 to make your own agar.io. Do every step 1 at a time. Also the backward is a graph paper image. Search that up. Enjoy