Slither.io is the most popular browser-based io game recently. You have to start with a small snake and need to kill other snakes because of increasing your size. In the game map, there are a lot of dots which you can eat to level up. The purpose of the game is cut to front of your enemies and then you will slay them. When you kill snake, it becomes points massively. In these days, a lot of players know how to play professionally.
Also, the game does not have many tactic to kill enemies easily. The most popular tactics are surrounding and using small snake flexibility. In addition, small snakes are more flexible than bigger snakes because size reduces their turn and speed capabilities. It has some different types of skins but they are not enough for many players. Some internet pages offer slither.io mods to players which provide zoom in-out, speacial skins and more features.