Slither.io is

Compete against others online. Can you become the longest snake?
If your head collides with another player, you'll explode and it's game over. But if others crash into you, they'll explode and you can consume their leftovers.
In slither.io, even the smallest have a chance to win. Outmaneuver larger opponents by dodging in front of them, regardless of your size.
Download now and start playing. Good luck.