Logic Masters Deutschland e.V.

• Fill the grid with digits 1 to 9 such that they appear once each in every row, column, and region.
• Cells surrounding a blue cage must contain all adjacent digits and multiples of the digit in cage (excluding that digit) once each. For instance if r4c7 was a 1, cells around it would be digits 2-9. If that same cell was a 3, then four of the surrounding cells would contain digits 2, 4, 6, 9 and the remaining cells could not be 2, 4, 6 or 9. If it was a 9, then there would be one 8 around it and so on.

Link to play: SudokuPad

Other puzzles with this ruleset:

• Chain Reaction