NOT AT THE ABOVE COORDINATES
It's about time Alpine had another mystery cache! I wanted to pick something like the Fat Cats would do, so I came up with this. Solve the sudoku by putting a digit 0 through 9 in every square, so each digit appears only once in each row, column, and 5x2 box. A2/5 means the contents of cell A2 divided by 5. If you see something like (J4 D1), that means you need to take the digits from J4 and D1 and put them together to form a 2-digit number (which can't start with a zero). Have fun!
You can validate your puzzle solution with certitude.