Overview

In the main hallway, just to the left of the Google both, there’s a vent, labeled “Google Ventilation”:

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Clicking on it takes me into the vents, with an initial message:

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Level Up

After crawling around a bit, I found a way to climb up (left). At first I had hoped it would be the exit, but it just another level of maze (right):

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Exit

After exploring the second level, I found an exit:

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On exiting, I’m dropped into Santa’s secret room, bypassing the badge challenge, and with a new achievement:

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Had I not already gone in via the badge reader, I could have also have unlocked the achievement for getting access to Santa’s secret room this way.

Map

The dialog suggested a map would be helpful. I completely agreed. In crawling the vents to find the exit, I made a map of the full maze (using everyone’s favorite Infosec tool, Excel):