collide with the powerup (0010), enemy (0100), and of course the ground (1000).
To tell the game engine this, we create a <em>bitmask</em> for the fixture.
This is a binary number with all the bits switched on that we want the entity to collide with.
In other words, the player&apos;s bitmask would be (1110).
We left the first bit blank so that the player can&apos;t collide with other potential players (player 2).
Let&apos;s update the table with the bitmask we want each entity to have:</p>
<table>
<thead>
<