Something

<?

$text = $_REQUEST['code'];

$final_output = "<img src='image.php?game=$_REQUEST['game']&color=$_REQUEST['color']&code=$text'>";

if (!$_REQUEST['game']) {
	$final_output = "<b>Please go back and select a Game</b>";
}

if (!$_REQUEST['color'] {
	$final_output = "<b>Please go back and select a Color</b>";
}

if (strlen($text)) != 12) {
	$final_output = "<b>Please go back and make sure to enter ONLY Numbers, no spaces or special characters. Make sure to enter exactly 12 numbers.</b>";
}
if (!is_numeric($text)) {
	$final_output = "<b>Please go back and make sure to enter ONLY Numbers, no spaces or special characters.</b>";
}

?>