custom-original.php

<?php

// Add extra user settings
function user_interests_fields( $user ) {
	if(!current_user_can( 'edit_user', $user->ID ) )
        return false;

    $is_gamer = get_the_author_meta( 'is_gamer', $user->ID ); ?>
	<h3><?php _e('Extra Settings', 'dp'); ?></h3>
    <table class="form-table">
        <tr>
            <th><?php _e('Is gamer?', 'dp'); ?></th>
            <td>
			<label for="user_interests_<?php echo esc_attr( $tag->slug); ?>">
                <input id="is_gamer" name="is_gamer" type="checkbox" value="1" <?php if($is_gamer) echo ' checked="checked"'; ?> />
                <?php _e('Check this if this user is a gamer.', 'dp'); ?>
            </label>
            </td>
        </tr>
    </table>
<?php }
add_action( 'show_user_profile', 'user_interests_fields' );
add_action( 'edit_user_profile', 'user_interests_fields' );

// Store extra user settings
function user_interests_fields_save( $user_id ) {
    if(!current_user_can( 'edit_user', $user_id ) )
        return false;

    update_user_meta( $user_id, 'is_gamer', $_POST['is_gamer'] );
}
add_action( 'personal_options_update', 'user_interests_fields_save' );
add_action( 'edit_user_profile_update', 'user_interests_fields_save' );