lunarsolver.user.js

// ==UserScript==
// @name         Lunar Puzzle Solver
// @namespace    http://reddit.com/u/undergroundmonorail
// @version      0.1
// @description  Find the correct solution for the Shenkuu Lunar Temple
// @author       monorail
// @match        http://www.neopets.com/shenkuu/lunar/?show=puzzle
// @grant        none
// ==/UserScript==

(function() {
    var angle = new URLSearchParams($("embed")[0].src).get("angleKreludor");
    var phase = Math.round(angle / 22.5);
    var answer = ((phase % 16) + 8) % 16;

    var table = $("#content > table > tbody > tr > td.content > div:nth-child(2) > form > table").children()[0];

    var row = answer > 7 ? 1 : 0;
    var column = answer % 8;

    table.rows[row].cells[column].style.backgroundColor = "red";
})();