Agar.io is a game created on the computer but has recently been developed into an app for ios and android. The concept is that you start out as a certain mass and you can eat little dots that gain you a certain amount of mass. The Bigger you are the slower but less risk of getting eaten. You can split into 2 pieces at another smaller cell but you have to be double their size as you are split into 2 pieces. The more mass you have the more you lose over time if you are not taking in as much mass. You can also gather a lot of mass by just absorbing all the little pellets that are dispersed around but this will only last for a certain amount of time.
        

A lot of strategy comes into this game with teaming where someone will split a lot to get a lot of people , and the other team mate will eat all of those except for one and then fill him up by pressing W and sending mass over to him. There has been a lot of recreation on this game. Examples are agarabi, agarplay.org, and many others. Agario even created a agar.io mods that you can download and play hunger games and have different skins to keep people from wanting to hack it. Some of the other possible game modes you can play are Hunger games where the last cell to survive wins , Hide and go seek , Extreme FFA , Teams , and Experimental which has large mother cells that disperse pellets. There are viruses on agar.io that are green and if you hit one you will explode. You can push these at other people by shooting your mass into those. Also if you go into the mother cell when you are smaller than it the cell will eat you and disperse your mass in pellets and if your bigger it will pop you like a normal virus
         

Overall I would probably rate this game a 9/10 if not even a 10/10 it has so much originality and is so simple anyone can play. There is a lot of strategy which I think is really fun and you always just want to be the biggest possible. This game has went viral since it was created in April 28, 2015. Agar.io has a top 10 biggest in the server and if the best games all played and had a list like that agar.io would for sure be on that list. If you haven’t played this game I thoroughly recommend you try it, you will love it.