Action Script 2 code for the 'Monkey Gun' Flash game:

//Main timeline:

stop();

var bullets:Array = new Array();
var i:Number = 0;
var hits:Number = 0;
var gold_hits:Number = 0;
var red_hits:Number = 0;
var time_left:Number = 60;

var myInterval = setInterval(this,"callMe",1000);

function callMe() {	
	time_left--;
	if (time_left <= 0) {
	  clearInterval(myInterval);
	  nextScene();
	  }
}

gun_btn.onRelease = function()
{
   i++;	
   attachMovie("bullet","b"+i,getNextHighestDepth(),{_x:188, _y:141});
   // the bullet array contains a simple sequence of numbers
   bullets[bullets.length] = i;
   
   trace("length of bullets array before removing an element: " + bullets.length);
   
   // to keep the bullets array from getting huge and hogging memory, only let there be
   // the most recent 10 bullets in there.  Unload the movie clip for the oldest bullet, 
   // and use the shift method to remove the first array element:
   if (i > 10) {
	 firstElement = bullets[0];
	 trace ("firstElement: " + firstElement);
	 removeMovieClip("b"+firstElement);
	 bullets.shift();	
	 trace("length of bullets array after removing an element: " + bullets.length);
   }      
}

onEnterFrame = function ()
{
	red_timeout_remaining--;
	
    for (j=0; j<bullets.length; j++)
	{
		n = bullets[j];		
        _root["b"+n]._x += 80;
        if (_root["b"+n].hitTest(_root.red_balloon_rising_mc))
		{
			/* When a shot is timed well, the same bullet will overlap the balloon
			   for two frames.  The following use of the "prev_successful_bullet" flag
			   makes a successful shot count as one hit instead of two.
			   
			   Also, to prevent a bullet's collision with an already
			   popped balloon from counting, I use a "timeout_remaining" flag so that 10 frames
			   need to pass after a collision before another collision will be credited:
			*/   
			if ((n != red_prev_successful_bullet) && (red_timeout_remaining <= 0))
			{
			    _root.red_balloon_rising_mc.red_balloon_mc.gotoAndPlay("popped");	
				red_prev_successful_bullet = n;
				red_timeout_remaining = 10;
			}
        } 
	}	
	
	gold_timeout_remaining--;
	
    for (j=0; j<bullets.length; j++)
	{
		n = bullets[j];		
        _root["b"+n]._x += 80;
        if (_root["b"+n].hitTest(_root.gold_balloon_rising_mc))
		{			 
			if ((n != gold_prev_successful_bullet) && (gold_timeout_remaining <= 0))
			{
			    _root.gold_balloon_rising_mc.gold_balloon_mc.gotoAndPlay("popped");	
				gold_prev_successful_bullet = n;
				gold_timeout_remaining = 10;
			}
        } 
	}	
	score = ( ((gold_hits*100)+(red_hits*50)) - (i*10));	
	if (score < 0) { score = 0; }
	hits = gold_hits + red_hits;
	
}