Overlapping grids are interesting, but I thought: why always align on thick region borders? What if I split them offset? The answer is: it is a much more difficult puzzle to set, but makes solving more interesting.
Trivia: When I set my normal logical auto-solver to the settings I like to use for testing, it gets “stuck” at one particular step. So if you solve the puzzle without using the walkthrough, you’ve done a better job than my logical auto-solver!
Even more trivial: The renban lines are almost perfectly symmetrical, but there are two differences.
Rules:
Normal Gattai-2 rules apply. That is, there are two overlapping 9x9 Sudoku grids. Within each Sudoku grid, each row, column, and 3x3 box contains the digits 1-9. Cells which are part of both grids are constrained by both grids.
The marked diagonals each contain the digits 1 to 9 exactly once.
Digits on each pink line form a non-repeating set of consecutive digits in any order.
Digits within cages do not repeat, and sum to the total in the top-left corner of the cage.
Estimated difficulty: 3.5 out of 5
Spoiler-filled walkthrough
