How can I password protect a WordPress site without requiring users to log in?

You could add a statement to the end that require them to answer a question if they dont have a cookie set and sets a cookie when they do, allowing them access to the site. I’m on my phone but something like this.

<?php 
if($_POST['q'] == 'answer') { 
// set cookie
} elseif($_COOKIE['q'] != 'cookie') {
// include question template and die
}
?>