Rules of Game

As I mentioned earlier, there is actually one and simple rule in game: Bigger cells eat smaller cells. This rule is the most important thing in the game. I also mentioned in “About page” about main rules that everyone can get after playing for some time. These were:

  1. Eat the pellets (small foods) on the screen and other player’s smaller cells to increase the mass of your own cell(s).
  2. Avoid other player’s larger cells, escape from them, because they can eat your cell likewise.
  3. Your cell can split into half (with SPACE key) and will be thrown forward to attack and eat smaller cells.
  4. Your cell can eject mass (with W key) for some reasons (I am explaining these reasons in this post “Uses of Ejecting Mass (W Key)”, click here for further details).
  5. Avoid viruses and use them to your advantage.

In this article, I will go into a deeper level and inform you about mechanics of game. This article contains lots of numbers. After reading this, you can learn much about rules of and plan smarter strategies to attack your enemies.

Game Screen

  • Score: Your high score is shown on the bottom-left of the screen.
  • Leaderboard: There is a leaderboard on the top-right of the screen which shows top 10 players currently in that room.

Rules of Growth and Shrinking

There is one thing I strongly recommend: Check “Show mass” setting before you start playing. When “Show mass” is checked, you can monitor your exact mass during gameplay and be aware of which actions affect your mass size.

show mass agario

  • Your mass will increase one point each time you eat a pellet (small colored dots on screen).  Also you grow when you eat smaller cells.
  • Ejecting a mass will cause 90% 80% of mass that you have ejected loss from your total mass (was 16 points before). See Uses of Ejecting Mass (W Key) article for more detailed information.
  • Splitting into half (Space Key) does not change your total mass size. A new cell is emerged having a half – 50% – mass of original cell is thrown forward. You can have maximum 16 cells in the game, if you try to split more nothing happens.
  • Your cell always shrinks with proportional to your mass size passively. You can not even notice shrinking if you are small (up to 200) but when you reach a higher mass there will be a considerable amount of mass loss. When your mass size is near 1900, shrinking rate is 20 per second, that means you can not grow anymore even if you span and eat a rich pellet farm.
  • Maximum mass size you can ever reach for a cell is 22,500. When a cell reach this size, it won’t grow anymore. However it is possible to reach bigger score with multiple cells (each cell up to 22,500). This rule is valid when these cells combine.

Rules of Viruses

A virus is the green spiky round things in the game screen. They do not move. They are born at random locations. A virus makes a bigger cell explode if the cell touches it. Smaller cells does not explode even if it passes through the center of a virus.

Mass of a virus is near 140 at the time it is born. That means if your cell size is greater than 150 you get better not touch a virus.

Viruses get bigger if a cell ejects a mass into it. If a virus is ejected mass for 7 times, a new virus is emerged and thrown forward – through the opposite direction of ejection – just like what happens when a cell splits.

Rules of Eating

A cell must have a size of 25% more of target cell in order to eat it. For example target cell has a mass of 100. Your cell must be at least 125, otherwise your cell just wanders around the target cell and nothing happens despite you are bigger. Mass, in this game is the area of cell indeed. So the diameter of the hunter cell must be 10% longer than the target cell (sqrt(1,25) ~ 1.10).

  • Eating by splitting: Let’s calculate “eating by splitting” case. Again assume that target cell has a mass of 100. Then your eating-cell must be at least 125. So your original size must be at least 250 (125 x 2).  Consider this carefully because you should not split your cell unnecessarily or you will be a target for others.

I think this post will be the most solid post of this web site. Only numbers :) Other posts will be about tips and tricks for game, they will be based on this rules. If you think there is a change in this rules please state it in the comments section, then let us fix.

Now you know more about rules, have a nice gameplay. Ejected Mass
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A programmer, a husband and a gamer; especially loves games that has very simple rules but complex as life itself.


  1. Jose
    June 29, 2015 at 11:24 am — Reply

    Everything is very open with a clear clarification of the challenges.
    It was really informative. Your website is very
    useful. Many thanks for sharing!

  2. Mike
    July 14, 2015 at 6:23 pm — Reply

    Thank you for the help, this website has many info about
    Thanks again!

      July 15, 2015 at 8:01 am — Reply

      Thank you sir, it is good to hear that :)

  3. Jeff
    August 6, 2015 at 11:23 am — Reply

    It might not be the same as on the computer but on the Android app you can definitely reach a mass greater than 22,500. I have gotten up to 115,031. I might have misread what you were saying about that however.

  4. Dabac
    November 7, 2015 at 12:28 pm — Reply

    I noticed some players that are huge eat “bushes”?? How come? Is it new rule? Small ones explode, and the big ones just eat the bush.

  5. askari_highness
    January 3, 2016 at 11:39 am — Reply

    after getting splitted how to get joined

    • İbrahim Sidat
      January 4, 2016 at 12:08 am — Reply

      You have to wait a some time to join up.

  6. Rod
    January 9, 2016 at 9:22 pm — Reply

    Usefull will be to know about rejoin timings after splitting, according to cell size.

  7. Rory
    January 10, 2016 at 2:36 am — Reply

    How do some cells eat the viruses? I always explode while others can eat it…

    • İbrahim Sidat
      January 10, 2016 at 11:03 am — Reply

      “You can have maximum 16 cells in the game, if you try to split more nothing happens.” If you have 16 cells and touch a virus, you will eat it.

      • Charles Daher
        January 26, 2016 at 8:52 am — Reply

        Exactly. I use this for farming viruses:
        When you’re a size 500 or so, go to a site where there’s many viruses close. I like 4 or 5 minimum. Split in 2 and hit a virus with one of your cells. you’ll become one big cell and 15 small ones. Now go around an eat the viruses with the remaining big cell. Goes very fast and you get to 1000 plus size.
        the trick is to do it with a partner protecting you or when you’re kind of alone. Even if you get a few cells eaten, your overall gain may be worth it.

  8. Redrum
    February 27, 2016 at 2:41 pm — Reply

    I have noticed at times after eating some of the Virus blobs I will start loosing mass at a rapid rate. Is there a max number of virus you can eat or is there another reason for this?

  9. Jack
    March 30, 2016 at 4:11 pm — Reply

    Soo. how do you gain experience points? How are they calculated?

  10. Nick
    May 10, 2016 at 11:22 pm — Reply

    What I do if anyone is chasing me with a Mass of 150 or more and I’m less than that, I just hide underneath a Virus because it will make Bigger Cells split and it also makes a great hiding place too

  11. Joe
    July 28, 2016 at 5:22 pm — Reply

    I am going to have to say the rule to be 25% or more to eat a cell is incorrect. I was just eaten and I was around 2100 and shrinking. After the guy split and ate me I saw his other cells and they were roughly that size considering time of shrinkage since eating. If this rule were true, the cell would have to have been over 2600 to have consumed me which he was not. So that mechanic needs to be evaluated.

    On a side note, I am curious as to people using hacks to increase speed to overtake smaller players. This has happened on more then one occasion.

  12. Brice
    October 31, 2016 at 9:07 pm — Reply

    I try to get on and get user_banned_title. What do I do. I havent even played before.

  13. Anand Thakur
    July 22, 2017 at 11:45 am — Reply


    This is Anand …

    I am playing Agario from last 2 Years,from last few days there was problem to connect Oceania Server.. I always love to play in Oceania Server Only..

    But now days its not connecting… and if connected its LAG always…

    Kindly guide me

    and do the needful at your earliest

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