You have now unlocked the achievement, making the following step optional. The rocks in the Crazy Place have stopped falling down, making the area a viable holdout location for high rounds, giving the player a wide open area with no threat from Panzersoldaten or the Giant Robots, as well as pedestals providing all four staffs in the vicinity.
If you decide to proceed in freeing Samantha, deploy the Maxis drone in the Crazy Place which will fly in the blue portal in the sky. Now step on the central blue shrine and press the action button to "access the teleporter". Congratulations, you have completed the Easter Egg.