Interact with the reading desk in the center of the library. Place the three Torn Parchment Sheets onto the desk surface to assemble a numerical grid puzzle code: 7 - 3 - 9 - 4 .

Unlocked after completing main game.

Cross to the other side of the room, wait for the earthquake, then solve the door puzzle. Go around the corner, down the hall, and through the door to .

Search the debris in the back-left corner of the vault. Pick up Gear A (Large) and Gear B (Small) .

Go through the side door to .

The journey begins in the entry room of the pyramid. Your goal is to unlock the main chamber door.