 class="hljs-comment">-- Some code to handle the collision goes here...</span>

  <span class="hljs-keyword">end</span>
<span class="hljs-keyword">end</span>
</code></pre>
<p>But what if you had power-ups and you want players to collide with the power-ups but you don&apos;t want enemies touching the power-ups?
Things can get complicated pretty quickly:</p>
<pre><code class="lang-lua"><span class="hljs-keyword">local</span> begin_contact_callback = <span class="hljs-function"><span class="hljs-keyword">funct