what to do at the end

I like to write a finale() function to call when the round is complete.
It needs to do two things: clear the highlight and highlight the first letters in lightblue. Try writing it yourself and working out where to call it.

finale() in functions.js
function finale() {
  var el=document.getElementById(g_square_id);
  el.style.backgroundColor='white';
  var id=0;
  for (var row=0;row<10;row++) {
    var el=document.getElementById(id);
    if (el.style.visibility=='hidden') break;
    el.style.backgroundColor='lightblue';
    id+=10;
  }
}
additions to move_on(id)
...
        highlight(id);
      }
    }
  } else {
   finale();
  }
}