Non-Facebook version of my Numbrosia puzzle. No registration required. Very addictive.
numbrosia.com
numbrosia.com
On the other hand I like Minesweeper, so maybe the algorithmic solvability is not the main criterion. Not sure :-/
But all this doesn't matter. As long as I get traffic, that's what counts.
As I said, I really like your idea, it wasn't meant as criticism. It could easily become a very popular game, like Sudoku or Minesweeper.
How many cookies do you have from numbrosia.com? What is the path in each one?
You might try deleting cookies from numbrosia.com and try again.