[рони]

StartGames,
проверять на своём сервере

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script>
$(document).ready(function() {
let date = new Date(Date.now() + 86400e3);
date = date.toUTCString();
function getCookie(syslike) {
  let matches = document.cookie.match(new RegExp(
    "(?:^|; )" + syslike.replace(/([\.$?*|{}\(\)\[\]\\\/\+^])/g, '\\$1') + "=([^;]*)"
  ));
  return matches ? decodeURIComponent(matches[1]) : undefined;
}
var syslike = getCookie('syslike');
alert(syslike);
if (!syslike) {
  document.cookie = "syslike=Y55YY56YY57Y; expires=" + date;
  alert(getCookie('syslike'))
}
});
</script>