When you start the game your a big blue blob on the page. You can move the mouse in the game to make the blob move. In this game you want to eat all the dots on the screen, except for the big green fuzzy blobs.You can also make yourself into more blobs by pressing space. This also makes you grow by some amount. The goal of this game is to get as big as you can before the big green blobs touch you. The big green blobs can't be controlled by anything, therefore they pop up randomly and can touch you anytime. The only consequence for touching the big green blobs is shrinking in size by 50%, so you can keep playing the game. Remember: you are more vulnerable to touch the big green blobs when you are big!
How to make Agar.io on Scratch (YouTube) by Hackingtons Code School for Kids