Slither.io

Game description:

If you are not sure that the cutest animals on earth are snakes, then you have a chance to change your mind with Slither! This one is another cool Io title, where you are going to play for a snake. The game mimics an old and famous snake-game from mobile phones, where you needed to eat apples and grow your tail. Like in that old game, you need to stay away from your own tail. However, there are more problems here – you need to avoid other players as well. Be careful and grow to become a real anaconda!