i likely ran into the same or a related issue. i dont know much about javascript though.

        for(var i = 0; i < elevators.length; i++) {
            elevators[i].on("idle", function() {
                for(var j = 0; j < floors.length; j++) {
                    elevators[i].goToFloor(j);
                }
            })
        }

it only works for "i < 1" and then only the second elevator moves... its kinda sad as i immediately enjoyed playing ...