Cells on Agar.io
Player Cells are the cells controlled by players of the game. Players can name their cell, the name of a cell is referred to as a 'Nick'. These cells spawn as a random color and may use skins, and your goal is to become the biggest cell out of all of them. They start with 10 mass originally, while those players who log in to Facebook can level up to start with as much as 43 mass, and can eat any cell including other player cells, provided that they are large enough. The speed of these cells decreases as they grow larger. All player cells are subject to a gradual loss of mass whose rate increases with cell size. Because of this, Player Cells must eat in order not only to grow but to avoid losing the gains they've already made. Very large cells lose mass at a frantic pace, making maintaining a very large mass challenging. The lowest amount of mass a Player Cell can have is 9, at which point they will stop losing mass. Player Cells will not exceed 22,500 mass.
If a Player Cell splits via the use of the space bar or the split button in the Mobile version, they will be divided into two smaller cells, both equal to 50% of the mass of the original cell. This mechanic functions in that each original cell remains in its previous position, loses half its mass, and a new cell with equal mass are projected from its position in the direction of the cursor. Split cells will start to merge back together semi-randomly if they are touching each other.Players can also increase the size of their cell by consuming other players' cells, however, to do so, their cell must be bigger than that of their target by 10%, or 30% if a split cell is fired, and overlap it by a majority. Consuming another cell adds its mass to their own, similar to consuming a food pellet. Consuming other cells adds their mass to the player's own, similar to consuming a food pellet. Cells lose mass over time based on their size, the rate of loss increasing with the mass of a cell at an exponential rate. A good strategy to counteract this is splitting into two or smaller cells when not under threat from other players to gain pellets faster.
Food Cells aka pellets are the main way of growing in the game. They are tiny passive cells that frequently spawn across the realms at a random location. When spawned they are the size of 1 Mass and slowly over time they can grow to become up to 5 Mass. Food cells at maximum size can be distinguished by having a dark pulsing outline, making them more visible to players. Consuming a pellet adds its mass to your own. All food cells can be eaten by Player Cells of 10 Mass. Note that food Cells are not consumed by Viruses.
Ejected Cells are cells of 14 mass that ejected by Player Cells, which behaves similarly to a food pellet. Take note though that although the ejecting cell loses 16 mass, the resulting lump will only give 12 mass to the cell that consumes it (25% of the mass is lost), therefore making this a lossy process. They can be consumed by Player Cells and Virus Cells. This mechanic is especially useful in Teams mode, as it can be used to increase the size of an ally to allow them to consume a larger cell on an opposing team. They do not consume any cells. Keep in mind that any other cell can eat what you eject, so make sure you are in close range of the cell you'd like to eject too. Also, ejecting can also be used as a speed boost.
Not to be confused with Virus, which is a skin. A virus is a green cell that can be used offensively and defensively. Should a cell consume a virus, it will "pop", sending out 15 or less bite-sized bits of the cell in different directions. This only happens when a cell of 133 mass or greater consumes a virus, and it will gain 100 mass at the cost of splitting into many pieces, making them easy targets for other cells. Cells not large enough to consume a virus will pass through it harmlessly, making it a haven for small cells. Small cells can use viruses to hide from large cells or plot a sneak attack against smaller cells. When a cell reaches 100 mass, it will be seen in front of the virus instead of behind it. Once a player has 16 independent cells, running into a virus with a cell of over 132 mass will result in the virus being consumed without additional splitting, only gaining 100 mass. Keeping in mind that a cell with a mass of 266 or more can split into a virus such that the player left with one cell of mass 133 or greater and (ideally) 15 other cell fragments. The large cell can then gobble up any nearby viruses with impunity. This is a high-risk strategy that can easily backfire but can yield massive gains very quickly provided there are enough viruses packed closely enough and there aren't any other players immediately nearby to gobble up any of the 15 smaller cells.
A new virus can be created by a cell by ejecting a maximum of 7 blobs by using the 'W' function. When the virus are given the seventh blob, it will eject another virus in the direction the player is moving. This mechanic is often used to attack larger cells which would otherwise be impossible to consume for the player. Keep in mind that when a cell is in range to give mass to a virus, it is also in range for the ejected virus. Ejecting viruses at other cells has a considerable risk of counter attack. Viruses that are closer to ejection appear swollen and have more spikes. Whereas Viruses are no longer able to be duplicated in Experimental mode. Instead of launching a second virus hurling in the opposite direction of the oppressing cell, the virus will move a small length forward for each amount of mass given to the virus. This can be a lot more mass-consuming, and makes it a lot more challenging to launch a successful virus into a cell.
Mother Cells were temporary additions to Experimental Mode. At first, they seemed to be simply a larger version of the virus, but with a few differences. Located in the center of the map, it was the size of a 5000 mass cell and ejected 1/7 of the map's food in random directions around itself. The mother cell could not be pushed or moved through. A large amount of food surrounding the mother cell led to a high concentration of smaller cell activity, which brought larger cells to the mother cell as well. Using the mother cell for food/hunting was a high risk, high reward activity. The Mother Cell was eventually removed from Experimental Mode, replaced by a similar mechanic named Spawners.
Spawners Cells are crimson colored viruses that can be found only in Experimental Mode. They periodically spawn pellets, similar to the removed Mother Cell. The spawner is slightly larger than a regular virus, roughly the same size as a 240 mass cell, and requires a mass of ~300 to consume. A cell of 160 mass or less will be consumed by a spawner. When a cell is consumed, its mass is turned into pellets and distributed around the Spawner. Spawners can also eat viruses. It spawns varying amounts of pellets, presumably taking a portion of the map's food spawning (like the mother cell). The spawner also refunds all mass it gains as pellets, either from ejections or by consuming smaller cells. So, beware! If given more mass than it can eject as food immediately, it swells up and subsequently shrinks over the course of the next few seconds as it releases pellets. When consumed, the spawner has the same effect as a virus, splitting the cell into a lot of cells. If you run into one, you will be eaten, and the Spawner will gain your mass and slowly throw it out over time.