Loop through entries in a Matrix block type
I'm assuming you are talking about your block type having a Entries field within.

You simply loop through it like this:

{% case 'BlockType3' %}
&lt;div class="row"&gt;
{% for entry in block.entriesFieldHandle %}
    &lt;div class="col"&gt;{{ entry.title }}&lt;/div&gt;
{% endfor %}
&lt;/div&gt;