Simple slither.io server forcer userscript

slither-forcer.user.js

// ==UserScript==
// @name        slither-forcer
// @namespace   SYZYGY-DEV333
// @description Forces connection to a specific slither.io server
// @include     http://slither.io/*
// @include     https://slither.io/*
// @version     1.0
// @grant       none
// ==/UserScript==

function updateElem() {
  currServ = bso ? bso.ip + ':' + bso.po : 'None';
  var x = snake ? parseInt(snake.xx) : 0;
  var y = snake ? parseInt(snake.yy) : 0;
  topElem.textContent = 'Server: ' + currServ + ', ' + 'X: ' + x + ', Y: ' + y;
}

function force(elem) {
  var splitArr = elem.value.split(':');
  if (splitArr.length > 1) forceServer((splitArr[0] || ''), (splitArr[1] || ''));
};

var topElem = document.createElement('span');
window.onload = function(){
    topElem.style.position = 'fixed';
    topElem.style.zIndex = '666';
    topElem.style.top = '5px';
    topElem.style.textAlign = 'center';
    topElem.style.width = '100%';
    topElem.style.fontSize = '20px';
    topElem.style.fontFamily = 'Verdana';
    topElem.style.color = '#FFF';
    document.body.appendChild(topElem);

    var parent = document.getElementById('playh');
    var div = document.createElement('div');
    var input = document.createElement('input');
    var button = document.createElement('span');
    var currServ = 'None';

    div.style.width = '244px';
    div.style.margin = '14px auto';
    div.style.background = '#4c447c none repeat scroll 0% 0%';
    div.style.boxShadow = '0px 6px 50px rgb(0, 0, 0)';
    div.style.border = '2px solid rgba(0, 0, 0, 1)';
    div.style.borderRadius = '29px';
    div.style.display = 'block';
    div.style.padding = '5px';
    div.style.fontFamily = 'Verdana';
    div.style.position = 'relative';

    input.type = 'text';
    input.placeholder = 'IP-Address:Port';
    input.style.margin = '2px';
    input.style.background = 'rgba(0, 0, 0, 0) none repeat scroll 0 0';
    input.style.border = '0 none';
    input.style.color = '#e0e0ff';
    input.style.fontSize = '15px';

    button.textContent = 'Go!';
    button.style.cursor = 'pointer';
    button.style.color = '#FFF';
    button.style.borderRadius = '24px';
    button.style.margin = '2px';
    button.style.padding = '2px 6px';
    button.style.background = 'linear-gradient(180deg, #9DA, #485)';
    button.onclick = function() { force(input); };

    div.appendChild(input);
    div.appendChild(button);

    parent.appendChild(div);
    timerID = setInterval(function () {
        updateElem();
    }, 1000);
};

To play with your friends, have them give you their server ip and port (it will be shown by the overlay), insert it into the IP-Address:Port field (as x.x.x.x:yyy), click Go!, then play game. You will now be in the same server. To find each other, you can use the coordinates shown in the overlay. the higher x is, the further to the right. The higher Y is, the further down. It's not too hard.