no the puzzle didnt change.
its definitly a vigenere cipher, the smaller puzzle is supposed to be a key of some sort i believe. Use the small one to figure out some kind of maze.
I also believe that if this is a true vigenere, then then key is just as long as the puzzle, give or take. the first two words are three letter, this is probably "you win."
if this is the case, the first part of the key should read: "AZYYXT"
use the key from the first puzzle to figure out the ciphertext. i hope
