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Segment 1: Solve the parlor puzzle
Segment 2: Bill Cipher's Symbol Cipher
Segment 3: Caesar Cipher
Segment 4: Vigenère Cipher, keyword Birthday
Segment 5: Convert numbers into their alphabetical equivalent
Segment 6: Reverse the alphabet and convert
Segment 7: Runes from Gravity Falls
Segment 8: Color substitution cipher from The Book of Bill
Segment 9: Play through and place the letters in the correct order as defined by the number.