$('#save-form').submit(function (e) {
    e.preventDefault();

    //serialize form data
    var postData = $('#save-form').serialize();
    //form the request
    var req = $.ajax({
        url: "save_game.php",
        type:"post",
        data: postData
    });

    //registering callbacks
    req.done(function (res, txtStatus, jqXHR) {
      //code executed on request success
        alert(res.msg);
    });

    req.fail(function (jqXHR, txtStatus, error) {
      //code executed on request error
        console.error("The following error occurred: "+textStatus, errorThrown);
    });

    req.always(function () {
        //code that executed always per request
    });
})