Dead End SE Mystery Cache
bellcurve: The concept behind this cache was a good idea, but the placement wasn't. I didn't think into the future about this placement and the growth of the area. I'll find another place for the container.
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Difficulty:
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Terrain:
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Size: 
(small)
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This is a easy cache to find, but you will need to solve the puzzle before signing the log.
CACHE IS AT THE LISTED COORDINATES.
Finding this cache will not be difficult. Opening the cache is the challenge. You will need to solve the attached puzzle in order to open the cache. The puzzle is a five-grid Sudoku. The same rules for regular Sudoku apply to the five grids. The added twist is that the intersections of the five grids must also follow the Sudoku rules. There is only one solution to the puzzle. It is not an overly difficult puzzle, but it will take time and logic to solve. After you solve the puzzle, you will need, in order;
R4 F13 A4 U20.
The cache itself is a small container, but the interior will only hold the log. Please bring your own writing utensil.
Permission to place the cache in this location was given by Dave Smith of the Cedar Rapids Parks Department.
In order to get credit for this find, you must sign the log. Please replace the cache as you found it. Good luck.
Congrats to RLowtek and Gloter on FTF!!
Additional Hints
(No hints available.)