In the ’90s, there was a game called Snake where the player has to collect stars for the snake to grow without touching the rest of their body or the edge of the screen. This game was available on most cellphones from the ’90s to the early 2000s.
There is an updated game to this that is available online and for mobile devices. Slither.io has the same concept but with more snakes doing something similar. The snake eats glowing stars to grow but the snake can touch its own snake body. The stars vary in sizes and growth size power-ups. The most sought after are the ones from other snakes after they crash into you which makes your snake grow twice as fast. This is the component that makes playing the game half of a survival game and other halves a tranquil game if you only focus on collecting stars and avoid the other snakes. The snakes can grow to a very large size that could take up two-thirds of the screen.
You can customize the snakes by either flipping through the predesigned patterns available like flags, solid colours or logos attached to snake bodies by a string. Or you can make up your pattern with preselected colours.
The game can be played against the computer or online with other players on the mobile game version. The website only offers online gameplay. The mobile version also has a secret cheat code section that could unlock types of snakes and abilities not available on from regular play.
Just to make sure that you have the correct version of the game. Slither.io is the domain name is of the original playable game. The other version slitherio.io is a virus game classified under adware which might give you pop-ups, spyware and malware. Run anti-virus software and talk to tech support of your operating system if you notice something weird about your computer or phone.