You can also just read the code (the third parameter is the decimal representation of the 'password'):

    ww.mode.register("home", ww.mode.HomeMode, null);
    ww.mode.register("cat", ww.mode.CatMode, 231, 8);
    var isAndroid = navigator.userAgent.match(/Android/);
    isAndroid || ww.mode.register("space", ww.mode.SpaceMode, 42, 8);
    ww.mode.register("pong", ww.mode.PongMode, 129, 8);
    ww.mode.register("bacon", ww.mode.BaconMode, 144, 8);
    ww.mode.register("simone", ww.mode.SimoneMode, 211, 8);
    ww.mode.register("eightbit", ww.mode.EightBitMode, 83, 8);
    ww.util.getAudioContextConstructor() && (ww.mode.register("song", ww.mode.SongMode, 219, 8), ww.mode.register("synth", ww.mode.SynthMode, 136, 8));
    ww.mode.register("ascii", ww.mode.AsciiMode, 127, 8);
    ww.mode.register("bowling", ww.mode.BowlingMode, 117, 8);
    ww.mode.register("rocket", ww.mode.RocketMode, 69, 8);
    ww.mode.register("burger", ww.mode.BurgerMode, 57, 8);