Exit - The Professor's Last Riddle

Still reeling from the news of your favorite archaeology professor’s passing, you have been enlisted in a rather peculiar assignment. It seems that instead of a will, he’s left an envelope with some postcards and a series of clues. Grab your passports — you’re about to embark on a global treasure hunt! Can you solve the riddles and uncover the mystery of the professor’s legacy? Difficulty level: 3 of 5