almost impossible challenge

/**
 * Copyright imo_ ( http://wonderfl.net/user/imo_ )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/yehg
 */

// forked from imo_'s oimo challenge lv.5
// forked from imo_'s oimo challenge lv.4
// forked from imo_'s oimo challenge lv.3
// forked from imo_'s oimo challenge lv.2
// forked from imo_'s oimo challenge lv.1
package {
    import flash.events.MouseEvent;
    import flash.text.TextFormat;
    import flash.events.Event;
    import flash.text.TextField;
    import flash.display.Sprite;
    public class FlashTest extends Sprite {
        private var target:int;
        private var xor:int;
        private var tf:TextField;
        
        public function FlashTest() {
            tf = new TextField();
            tf.defaultTextFormat = new TextFormat("monospaced", 24);
            tf.selectable = false;
            tf.x = 32;
            tf.y = 32;
            tf.width = 400;
            tf.height = 400;
            addChild(tf);
            target = xor = 0;
            addEventListener(Event.ENTER_FRAME, frame);
            stage.addEventListener(MouseEvent.MOUSE_DOWN, function(e:Event = null):void {
                setValue((getValue() + 1) % 10);
            });
        }
        
        private function frame(e:Event = null):void {
            tf.text = "Change this to 100 -> " + getValue();
            setValue(getValue());

        }
        
        private function setValue(value:int):void {
            target = value ^ (xor = uint(Math.random() * 0xFFFFFFFF));
        }
        
        private function getValue():int {
            return target ^ xor;
        }

    }
}