Parking Co-ordinates North 50 48.858', West 000 02.008'

The cache is NOT at the above co-ordinates and you do not need to visit the above co-ordinates to find it. It is however a good place to park, because it is less than 200m from the cache, (as the crow flies).

In order to find the cache you need to construct and then solve a fairly tricky Sudoku puzzle. You will need to know the rules of Sudoku and how to logically solve some simple algebra maths equations.

The co-ordinates of the cache are: North A0° BC.JKL', West 000° 0D.PQR'.

The letters A, B, C, D, J, K, L, P, Q, R are all digits between 1 and 9. Any zeros are put in for you. None of the letters represent a zero.

Stage 1 - Constructing the Sudoku

To construct the Sudoku you need to find the value of the following 8 letters: A, B, C, D, E, F, G & H and then substitute the numbers for those blue letters in the following Sudoku grid.

Each of the 8 letters represents a number between 1 and 9. All the 8 numbers are different from one another. Obviously because there are 8 out of 9 there is one number missing, but some Sudoku's are like that. I said it was tricky. You should be able to deduce a couple of the letters from the fact that the cache location is less than 200 metres from the above parking co-ordinates. Then you can find the other six by solving the following six equations:

D=Square root of D
F=Square Root of E
G=Square Root of B
H=B + G

Stage 2 - Solving the Sudoku

Having substituted the blue letters for the results above you should now have a standard solvable sudoku puzzle with 30 of the 81 squares filled with numbers. Six of the other 51 squares contain the red letters J, K, L, P, Q & R. Once the puzzle is completed, you will have numbers (between 1 and 9) in each of the squares that have red letters in them. Not all these numbers are different. Substitute the red letters for those numbers in the cache co-ordinate formula and, there's the cache location.