Sudoku puzzles are the LPC caches of the puzzle caching world. Pretty much anywhere you find puzzle caches, somebody will have created one of these sudoku puzzles. However, a couple of years ago pfalstad came up with a new take on the sudoku puzzle cache which adds some fun to the otherwise mundane sudoku puzzle. Because I've run out of creative ideas, I decided to copy pfalstad's idea (with permission) for this month's challenge cache. As usual, you'll have to struggle on your own without hints until the 15th of the month.
Zbir zbhfr bire vzntrf gb frr rapelcgrq uvagf.