agar.io is a growth arcade like game where the player starts off as a small organism that must eat smaller objects in order to grow bigger. While doing this the player must avoid other players on the field that are larger than them, who are in turn trying to eat them.
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Pros
Pro Deep gameplay
While looking overly simplistic there is a good bit of strategy to the game as players can split their cell in order to confuse or surprise attack foes as well as spit out excess cells in order to change ones size.
Pro Players can customize their cell
For those that register for the game they can customize their cell in order to have specific words or even use pictures. This allows one to stand out in the game and other players may take notice if you are often playing.
Pro Fun and addictive
The mechanics of navigating the screen area aren't all that easy to understand, so it's as much about figuring out the limitations of the board as it is about running away from the big guy.
Cons
Con Random respawns can lead to instant death
The game often sees players respawn right next to a large enemy which leads to them instantly dying, this can be frustrating when it happens a lot to a player.