should be relatively straight-forward to learn about so it will be left up as an exercise to read and study.</p>
<h2 id="exercises">Exercises</h2>
<ul>
<li>Play with the bitmasks. Can you make the enemy collide with the powerup instead of the player?</li>
<li>Take a look at how groups work as described in <a href="https://love2d.org/wiki/Fixture:setGroupIndex" target="_blank">Fixture:setGroupIndex</a>. This is a simpler, but more limited method of detecting collision. Can it be used to imitate the collision