Rock Paper Scissors is a simple script (no mysql needed) written in PHP for your downloading and playing pleasure.  This is mainly just an illustration of a simple login and execution.    It uses a text file named users.txt that contains  only user logins and scores for a simple session based tracking. No passwords needed.

“R~P~S is a slick improvement over the old R~R~R games we
used to play back in the Pleistocene.”
~ Grognar the Barbarian

$v){
		$user_parts = explode(':',$v);
		$users[$user_parts[0]] = $user_parts[1]; // users[username] = score
	}
	if(array_key_exists($login_user,$users)){
		session_start();
		$_SESSION['score'] = $users[$login_user];
		$_SESSION['user'] = $login_user;
	}
}
if($_POST['action'] == 'judge' && isset($_POST['choice'])){
	$winner=false;
	$choices = array('rock','paper','scissors');
	$player_choice = $_POST['choice'];
	if(in_array($player_choice,$choices)){
		session_start();
		$comp_choice = $choices[array_rand($choices)];
		echo 'Computer Picked :'.$comp_choice.'';
		echo 'You Picked :'.$player_choice.'';
		if($comp_choice == 'rock' && $player_choice == 'paper'){
			$winner = true;
		}elseif($comp_choice == 'scissors' && $player_choice == 'rock'){
			$winner = true;
		}elseif($comp_choice == 'paper' && $player_choice == 'scissors'){
			$winner = true;
		}

		if($winner == true){
			$score_t = $_SESSION['score'] + 1;
			$_SESSION['score'] = $score_t;
			echo 'You won. Your score is now:'.$_SESSION['score'];
		}else{
			$score_t = $_SESSION['score'] -1;
			$_SESSION['score'] = $score_t;
			echo 'You lost. Your score is now:'.$_SESSION['score'];
		}
	}
	$auth_arr = file(AUTHFILE);
	foreach($auth_arr as $k=>$v){
		$user_parts = explode(':',$v);
		$users[$user_parts[0]] = $user_parts[1]; // users[username] = score
	}
	$users[$_SESSION['user']] = $_SESSION['score'];
	foreach($users as $k=>$v){
		$temp_array = array($k,$v);
		$user_str = implode(':',$temp_array);
		$authstr .= $user_str . "\n";
	}
	file_put_contents(AUTHFILE,$authstr);
}
if($_POST['action'] == 'logout'){
	session_start();
	@session_destroy();
}

?>
Rock Paper Scissors
user

There will also be a demo and download version coming shortly so be sure to check back soon.

“Now, what beat rock ag’in?”
~ BillyBob