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Willits opens his in-game PDA for the next mission objective. The PDA contains maps, goals, e-mails retrieved from bodies, and so on. It's a cool little window into the world, but if you read some information carefully, you'll find hints to secret areas, inside jokes, and other minutia. For example, at one point you read an email that you've downloaded to your PDA from a supervisor. In it, you're asked to fix the loose floor panels in the Alpha Labs before someone falls through and is injured. If you read the e-mail, you'll know where to find the broken floor panels, which lead to a secret underground passage. You can then sneak up behind a number of demons and zombies and kill them before they can ambush you.