User blog comment:Mroddy/A Puzzle for Hallows Eve/@comment-5415357-20121029094707/@comment-26157209-20121029100727

Meep. I had forgotten to post that little bit of information in the text. When making the map in Sumopaint certain islands had vanished, so when I had to put them back, I used a different shade of blue by accident... The colouring of the islands play no role in the solution.