Codes are the key to many mysteries in Indiana Jones and the Great Circle. Youll need these codes to unlock the various safes and chests (and at least one door) found throughout the game.As you explore, youll find locked safes and chests throughout the game. In most cases, the code to unlock the safe or chest is associated with a mystery (what the Great Circle calls its side quests). Throughout these side quests, youll find notes, which give you hints as to what the code could be or you could just use this guide.In this in-progress Indiana Jones and the Great Circle guide, well run down all codes weve found so far, and where applicable, listed the mystery associated with it.Indiana Jones and the Great Circle codes, explainedMost chests and safes reward money or Adventure Points (XP, basically), but they also contain things like adventure books (which grant you access to new skills) or hidden relics associated with collect-em-all side quests.Below, see a running list for all codes weve found so far in Indiana Jones and the Great Circle, plus details about where to find them and what rewards you get for opening them. Weve also listed the mystery thats either associated with the safe, or the one youll play through when coming across it for the first time. That said, since the Great Circles levels are so open-ended, you might come across these under other circumstances.For more details about how to find some of these codes, weve included guides to some of the more involved side quests below. And if youve missed any of these safes or chests, you can return to previously explored locations by opening your journal, tabbing over to the Travels page, and selecting Revisit on the region you want to go back to.All Vatican codes in Indiana Jones and the Great CircleThere are seven codes in the Vatican. If youre looking for details on how to solve some of the more involved puzzles, see our guides to the Belvedere Courtyard chest, the Father and Son safe, the Secrets of Secrets safe, and the A Date to Remember chest.Safe/Chest LocationMysteryCodeRewardBelvedere Courtyard“The Stolen Cat Mummy”5238“Splinter Smash” adventure bookSistine Chapel“Secret of Secrets”4471“Cutman 1” adventure bookPost Office Cellar“A Savage Discovery”1136“Street Scrapper 1” adventure bookMuseum Wing“A Date to Remember”6380 “Vatican Medicine” exploration bookBorgia Tower“Father and Son”5873100 Adventure PointsMuseum Wing“A Nun in Trouble”7171Lost ArtifactExcavation Site“Signs of Trouble”1891100 Adventure PointsAll Gizeh codes in Indiana Jones and the Great CircleThere are four codes in Gizeh. If youre looking for details on how to solve some of the more involved puzzles, see our guides to the Bright Future chest and the Cloud Atlas chest.Safe/Chest LocationMysteryCodeRewardRoadside near Gizeh Workers Area“Bright Future”0926Dynamite (which explodes in your face)Nazi Meteorological Station“Cloud Atlas”0609“Gizeh Medicine” exploration bookNazi Compoundn/a40926Ancient RelicNazi Vehicle Depot“Idol of Ra”0805Harvest SteleAll Himalayas codes in Indiana Jones and the Great CircleTheres just one code in the Himalayas. Heres our guide to the Cipher Machine puzzle.Safe/Chest LocationMysteryCodeRewardKimmetz, Officer Lounge“A Harsh Climb”3666You get to move on in the storyCheck back soon for codes in Sukhothai, the final region of Indiana Jones and the Great Circle!