Snakes are the playable characters in Slither.io.
Players can press either the left mouse button or the space button for a quick burst of speed, but this will slightly decrease their snake's size and length, and it will also leave a trail of pellets behind them.
If a snake hits their head against the body of another snake they will die and it will be game over for that player. A dead snake will leave pellets where they died that other players can eat. A snake can also die when hitting the boundaries of the map, but they will not drop any pellets.
There are several skins that players can use. Skins change the appearance of a snake and the pellets left behind by it, but otherwise have no effect on the gameplay. By default, Players will use one of the first 9 skins at random. One can unlock access to the other skins along with the ability to select a skin in particular by sharing the game on a social platform from the front page.