The video game is called Agar.io and it can be found on Agari.io. It's a multiplayer game and you can choose a game mode. The game modes are Free for all, Battle royal, Teams, and Experimental. There's a leaderboard that you can climb. I've only got up to 13th place on the board. The cell's skin can be changed but that's not available to guests. You can type a name for the cell that you control. I tend to choose a name at random. The background is a grid and has a border that makes you squish when you go up against it. You use the mouse to control your cell. Press space to split it and 'W' to eject some mass.
The objective is to increase your cell's mass by swallowing small pellets that randomly appear and smaller cells. You must do this without getting eaten yourself, which is harder than you think. Unfortunately, I kept getting eaten. The more mass you gain the slower you go. There's also viruses (make you split), which are indicated at big spiky green circles, that you have to avoid as well as other players. Sometimes there's some lag, but no obvious glitches are apparent.
