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<p><a href="page.php?w=Prey_%282017%29">Prey</a>, and <a href="page.php?w=Deathloop">Deathloop</a>) use 451 or 0451 as part of the first code that the player encounters. This is in reference to System Shock games, which use it as part of the first door codes seen in the game; it is sometimes believed to be a reference to the <a href="page.php?w=Ray_Bradbury">Ray Bradbury</a> novel <a href="page.php?w=Fahrenheit_451">Fahrenheit 451</a>, though Spector stated in 2019 that this was not the case and that the code was used simply because it was the security</p><p>
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