All I can say is: SLITHER.IO + MC = SLYTHER.IO
The map is fully multiplayer compatible, it uses an ID system, meaning that over 2 BILLION different players could join.
And just a little warning: Items are used as the circles for gaining mass and armorstands for the snake parts, meaning that you need to have "a beefy computer" to render/load all the entities. The lag can kill the game.
Features
Servers
You are free to make a server out of this, as long as you give me credit! (Don't remove sign and skull).
YouTube
Please mail me at [email protected] in case you recorded playing a game on this map (including channel name and link to the video).
Also you have to place a link to this page and my IGN (Bertiecrafter) in the description of the video!
Limitation
Because of technical limitations (how detailed I could go, without making minecraft crash), you will die when you come within 2 blocks of a snake.
Mineplex
I am aware that mineplex has a similar game, but this map is different: