Agario

Eat cells smaller than you and don't get eaten by the bigger ones! Move your mouse to control your cell. Press the Space Bar to split your cell in two or more equal cells. One cell will remain where the splitting cell was, and the other will project forward in the direction of the cursor. This can be used to feed viruses, allied cells, or you can even feed yourself if you're split into multiple cells. Press W to eject some mass. Smaller cells move faster. Zoom in by scrolling up mouse wheel up and zooming out by scrolling down mouse wheel down.