Agar.io is an awesome multiplayer online action game. Players control a round colored cell in a map that looks like a square lined paper. Action takes place in a real time and there're only real people behind every cell. The objective of Agario is to grow a cell by swallowing both randomly generated small colored dots, which slightly increase a cell's mass and smaller cells, without being swallowed by larger ones. You loose if all of your cell's mass is being swallowed by another player. The more mass your cell have, the slower it will get. Large cells also continuosly lose their mass.
In Agario it is also possible to customize your cell with different nicknames; symbols and skins you can choose yourself. You can be a planet, famous internet meme or even a president! Current version of Agar.io allows players to play in 4 different game modes: FFA (Free For All), Teams, Experimental and Party. Experimental is a game mode where the developer can test out new features and mechanics, so don't be surprised. In the team mode all players are divided in 3 teams with 3 different colors, team with the most mass wins. Party mode (Private mode) allows you to invite some friends and create your own rules. There are also a Rush Mode, in which you have only 5 minutes to grow as much as possible. This game mode is only available for mobile version of Agario. The starting mass of every player is 10 points, every collected colored dot will add 1 point to your mass; absorbing other players you will automatically get all their points added to your current mass.
To guide your cell through the map you only need to move the mouse and cell will follow the cursor on the screen. Sometimes it helps to split your cell in two parts to outwit your enemy and avoid the death, to do that press SPACE. To unite your cell again let the bigger part absorb the smaller one. In case you are willing to build a team with other players attract them by feeding them some of your mass, press W to eject mass. Be aware of green circles with sharp edges, they will split your cell into a lot of really small pieces and throw them into a quite big distance, thus it will be easy for your enemies to absorb these small pieces.
In Agario players are able to gain levels. Advanced levels have higher starting mass and unlock new skins. To reach the next level you need to have enough experience. Amount of experience depends on how long you survive and how many players you kill. After reaching the next level you will also receive some coins, which you can use to buy more experience (XP Boost) or increase your starting mass (Mass Boost) for the limited amount of time and of course buy a new skins in the Agario store.