All bonuses
Enter "Et in Arcadia ego" as a code at the "Codes" screen under the options menu. This will unlock all levels (including the M0X Louvre level and the M0X Rosslyn level), all Visual Database entries, the music Orrery, all concept art in Rosslyn, all Louvre paintings that are displayed in the substitution puzzles, and all anagram puzzles in Rosslyn.