Wordpress CustomMetabox code

This works for SINGLE CHECKBOX — when checked, it returns the word 'on' but doesn't show the Description on the front-end?
<p><?php echo get_post_meta( $post->ID, '_cmb_test_checkbox', true);  ?></p>


Neither of these work for MULTI-CHECKBOXES: ( i know they're not too different)

<p><?php $value = get_post_meta( $post->ID, '_cmb_test_multicheckbox', true ); echo $value; ?></p>

<p><?php echo get_post_meta( $post->ID, '_cmb_test_multicheckbox', true);  ?></p>


This works fine for RADIO BUTTONS  (but not for MULTI-CHECKBOXES:)
<p><?php $radios = get_post_meta( get_the_ID( ), '_cmb_test_radio', false );
	  foreach ( $radios as $radio ) {
	      echo $radio;
	  }
	?></p>

This Does NOT work for RADIOS...
<p><?php $radios = get_post_meta( get_the_ID( ), '_cmb_test_radio', false ); echo $radio; ?></p>