So I played Slither.io and my biggest size was 3611. So what you need to do is eat all the smaller worms and the way to do that is you circle them and let them run into you. Then you eat them and also follow the blinking dots that move. Also go to the outsides of the cage in the game and there are less worms then you can get bigger and go back to the middle but be sure not to run into the rims of the cage it will kill you it's color is red.
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