In column 28 - 30 you can see the letters like this:

28 29 30 - columns
     
          E
L
     U
C

= CLUE

Just a coincidence?

Edit: Also, the red and green dots remind me of minesweeper. And maybe if you worked out the positioning of the bombs, it could form a picture.

Green - 1
Red    - 2
Orange - 3

Just a thought.