This is the hardest level, so plan to spend some time solving this one.
Click here for Hint 1
Click here for Hint 2
Click here for Hint 3
Click here for Hint 4
Click here for Hint 5
Click here for Hint 6 (Solution to Ring 2)
Click here for Hint 7
Click here for Hint 8
Click here for Hint 9 (A big hint, though it may not seem like it)