You will only need to find one of the three Easter Eggs in order to receive the achievement and the trophy at the end of the game.

In the stairway to the cellar, stand next to the first lamp on the wall and use the EMF reader.



Close out of the EMF reader, then click on the bricks to the left of the lamp.



You will discover an egg concealed behind one of the bricks!

Unlock the coffin with the bird plate on its lid. Open and close the coffin five times.

You'll find an egg in the eye socket of the skeleton.

NOTE: You must do this prior to solving the puzzle.

On Charlotte's jewelry box, press the tiles down all along the left side, all the way across the bottom, and all the way up the right side.



You will find an egg inside!

On the table in Charlotte's bedroom, open the circular box and place all three eggs in their corresponding holders.



You will be able to read a secret masquerade poem.