From: United States
I haven't worked sudoku in years. This looks like fun, I'm going to give it a shot.
It *is* fun, but it is also challenging to keep each box separate, especially where 6-boxes and 9-boxes overlap. Even with heavier lines, the eye does not always want things to line up the way the brain knows they should. This must have been quite "interesting" to set up I'm sure glad that none of the 9-boxes are jigsaws or 'X's