For anyone still struggling with the Playfair Cipher:
The letters accessed at the end of Level 7 serve as the keyword for the cipher. The rest of the blank spaces are filled in with the remaining letters of the alphabet. In the Wikipedia article Korovev posted, it says that I and J are traditionally used as interchangeable to make the alphabet fit a 5x5 grid, however Jhon uses W and V as interchangeable. After filling out the key, the rest of the rules described on Wikipedia can be used to crack the cipher, resulting in a nine digit code in word form. An example of the form would be ON ET WO TH RE E...etc. Both sets of letters work with the key to open the doors to the laboratory.
Great job on the Age, Jhon, and happy URU-ing!