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This is the well known Sphinx Riddle ... check on the net
Answer: A MAN
You simply need to change the value of the letters by one
Answer: The next clue is based on a morse code
This is a form of Morse Code
Vigenere is a method of encryption; however, you need the key ... given in the third clue.
Answer: Coconut
We won't give you the answer this time.  It is up to you to work it out.






Puzzle #2 (Easy)







Puzzle #3 (Average)









Puzzle #4 (Hard)

To solve this cryptogram, Vigenere will be your friend. But to find
the right key, you will need to solve puzzle #3 first.
Clue #1 (Easy)

What goes on four legs in the morning, on two
legs at noon, and on three legs in the evening?