Cracking the Father and Son safe code in Indiana Jones and the Great Circle is one of the first really tricky puzzles that you encounter in the game, and that's saying a lot when you find a new mystery to unravel every five minutes or so. This one appears in the Vatican after you save Giuliana during A Nun in Trouble and it'll require all of your critical faculties to solve...
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How to get the safe code in Indiana Jones and the Great Circle
Source: PC Gamer (opens in a new tab)