Cheat mode
Choose the "Codes" selection at the "Options" menu:
THE VITRUVIAN MAN - Louvre Revisted level unlocked
Mansion: Shed box
The code for the box in the shed is 13, 21, 34.
Answer to the Puzzle "OH LAME SAINT"
The Answer to the Anagram puzzle "OH LAME SAINT" is "THE MONA LISA"
level 7 Cryptogram Answer
The answer is "OUTDOORS THE GRACEFUL WATER YOU WILL SEE THROUGH DEDICATION YOU MUST FIND THE KEY"
THE LOUVRE REVISITED (Secret Level)
This level is an extra awarded to you after completing the game. There are 9 cryptogram puzzles in here to solve (in total), and they can be found with the UV light on the paintings that represent each of the 9 levels of the game. You have one puzzle for every secret you found in the game.
ANSWERS TO THESE CRYPTOGRAMS:
The Louvre Museum Painting:
"YOU SHOULD NOT HAVE RUN MONSIEUR SAUNIERE NOW TELL ME WHERE IT IS"
St. Sulpice Painting:
"THE SISTER MUST HAVE BEEN CALLING PRIORY MEMBERS WHEN SHE WAS ATTACKED"
Normandy Mansion Painting:
"ITS THE PRINCESS SOPHIE KEY MY GRANDFATHER PROMISED ME"
Bank of Zurich Painting:
"IT IS THE CRYPTEX THIS IS BASED OFF OF A DESIGN BY DA VINCI"
Chateau Villett Painting:
"THE LEGEND OF THE HOLY GRAIL IS A LEGEND ABOUT ROYAL BLOOD"
Biggin Hill Airfield Painting:
"SAUNIERE BROUGHT US TOGETHER TO FOLLOW THESE CLUES FOR A REASON"
Temple Church Painting:
"SILAS TAKE THE KEYSTONE FROM MR LANGDON TEABING IS OUR HOSTAGE NOW"
Westminster Abbey Painting:
"TEABING FELT THE TRUTH CRASHING DOWN ON HIM THE GRAIL WAS LOST TO HIM"
Rosslyn Chapel Painting:
"THE QUEST FOR THE GRAIL IS THE QUEST FOR THE DIVINE IN EACH OF US"
ROSSLYN CHAPEL REVISITED (Secret level)
This level is also unlocked by completing the game, but unlike The Louvre Revisited, there is absolutely nothing to complete in here. The rotating solar system model where the globe was during the game allows you to play various music tracks from the game and examining the Sun gives you a full screen view of the solar system. In the room that had the trap door in the floor, there is a table that will display all of Da Vinci's invention models that you found during the course of the game. Take the trapdoor down to the lower room and in here you will find all the concept art that you unlocked by finding the secrets during the game. And thats it your DONE!!