PLEASE HELP why wont this script work

[chris_s_22]

this is my project
http://www.pinkangel4u.com/truthdare/Game/index.php
you can login with ussername=chris pass=smith

the gameboard can seen here so you can get a gist of my full project
http://www.pinkangel4u.com/truthdare/Game/gameboard.php'

anyways i am having trouble getting the following form details when entered to be sent and added to the database

<?php

function create_game($playername, $sex)
{
	if($_POST){ 
	foreach($_POST['player'] as $post_key){ 
	$query_string .= " ('".$post_key[sex]."', '".$post_key[playername]."'),";	} 
	$query_string = substr_replace($query_string,"",-1); 

// store the information in the database

$query = "insert into game (playername, sex) values ('.$query_string')";
$result=mysql_query($query) or die ('Could not add players.');
// if suceesfully inserted data into database, send confirmation link to email 
	if($result)
	{
	header('Location: http://www.pinkangel4u.com/truthdare/Game/gameboard.php');
	}
}  

?>

please help
christine xxx

[chris_s_22]

please help im getting Column count doesn't match value count at row 1

<?php
function create_game($playername, $sex) {
        if($_POST) { 
                foreach($_POST['player'] as $post_key) { 
                $query_string .= " ('".$post_key[sex]."', '".$post_key[playername]."'),";
                } 
                $query_string = substr_replace($query_string,"",-1);

            // store the information in the database
            $query = "INSERT INTO `game` (`playername`, `sex`) values ('.$query_string')";
            $result = mysql_query($query) or die(mysql_error());

            // if suceesfully inserted data into database, send confirmation link to email 
            if($result) {
                    header('Location: http://www.pinkangel4u.com/truthdare/Game/gameboard.php');
            }
    }}
?>

[NogDog]

function create_game($playername, $sex)
{
   if ($_POST)
   {
      $query_string = "";
      foreach ($_POST['player'] as $post_key)
      {
         $query_string .= " ('" . $post_key['sex'] . "', '" . $post_key['playername'] . "'),";
      }
      $query_string = substr_replace($query_string, "", -1);

  // store the information in the database
  $query = "INSERT INTO `game` (`playername`, `sex`) values ".$query_string;
  die($query);
  $result = mysql_query($query) or die(mysql_error());

  // if suceesfully inserted data into database, send confirmation link to email
  if ($result)
  {
     header('Location: http://www.pinkangel4u.com/truthdare/Game/gameboard.php');
  }
   }
}