The series
The Sudoku grid is a 9km x 9km square centred on Northwich. Each
1km x 1km Ordnance Survey grid square in this area represents a
cell in the Sudoku puzzle. The SW corner of the grid is at
N053°12.998', W002°35.127' (SJ6100069000); the NE corner of the
grid is at N053°17.885', W002°27.096' (SJ7000078000).

Image produced from the Ordnance Survey Get-a-map
service.Image reproduced with kind permission of Ordnance Survey and Ordnance Survey of Northern
Ireland.
Hidden in some of those squares are caches, such as this one,
that contain the number for that particular cell. The cells that
contain clues are indicated by question marks. Each cell is
referred to using a 4 digit OS grid reference for it's South West
corner.
The cache
This is cell SJ6974. GPSr accuracy is pretty poor beneath the
trees so you might find the hint more useful than the coordinates.
Also, there's a steep bank nearby than can get pretty slippery when
it's wet so take care.
The cache is a 0.4l screw top beaker inside a camouflage bag.
Inside the lid you will find the following information:
- The OS grid square reference (for example: SJ6477)
- The number that you need for the Sudoku puzzle (for
example:9)
- The cell reference (for example d1)
The cache contains a customised “Northwich Sudoku”
first to find badge, a log book, a pencil, a sharpener and various
swaps.
When you have found enough clues, you will be able to solve the
Sudoku puzzle and find the
Puzzle Cache.
Good hunting