Logic Masters Deutschland e.V.

Puzzle Name: Mine Counter
Puzzle Type: Duality
Puzzle Link: F-Puzzles or Sven's Sudokupad



Rules:

1. This is a duality type puzzle. Each type of clue serves two purposes.
2. Classic: Normal Sudoku rules apply.
3. Counting Circles: A number in a circle indicates how many circles contain that digit. Minesweeper: A digit in a circle indicates how many shaded squares that circle sees in itself and the squares all around it.
4. Yin-Yang: Shade some squares such that all shaded cells form one orthogonally connected region, and all unshaded cells form another orthogonally connected region.
   Some shaded (red) and unshaded (blue) cells have been given. (If you prefer to use your own colors, these can be turned off in the settings, by selecting "hide colors.") No 2x2 block of cells may be either shaded or unshaded.
   The unshaded region serves as an anti-german whisper, where any two adjacent orthogonally connected digits must have a difference of five or less.
5. Digital Duality, or Blackjack: For the purposes of the anti-whisper region, an "Ace" (the digit "1") can have a value of either 1 or 11. A single "1" my have two different values simultaneously for two different uses of the clue.
6. Killer: Shaded digits in a killer cage sum to the number in the top left corner of the cage. Digits may not repeat in a cage.
   The killer regions serve as a windoku constraint.