Logic Masters Deutschland e.V.

This puzzle was inspired by Lake and uses the excellent constraint invented in his puzzle Ace is high, with an additional twist suggested by Ratfinkz: the digit 1 can be high, low, or both at once for different clues. It also uses the other constraints from her excellent puzzle Diamond Mining. I hope you enjoy it!

Rules:

• Sudoku: Place the digits 1-9 once each in every row, column, and 3x3 box.
• Aces High?: The digit 1 counts as either value 1 or value 10 for every clue in the grid (including Anti-Knight). Any digit 1 can simultaneously have different values for different clues affecting the same cell.
• Counting Diamonds: A digit value in a diamond counts how many times that digit value appears in all diamonds.
• Anti-Knight: Cells a chess knight’s move apart may not have the same digit value. ("Aces High?" applies separately to each pair of cells which are a chess knight's move apart.)
• Arrow: The digit values along an arrow line must sum to the digit value in the attached circle.
• Kropki Pairs: Cells separated by a black dot must have digit values in a 2:1 ratio. Not all black dots are necessarily given.

Streamers have permission to use this puzzle.

Play in SudokuPad

Hint: The combination of constraints means that Anti-Knight does not ever apply to 1s in this puzzle.