Logic Masters Deutschland e.V.

Sudoku: Place the digits 1-9 once in each row, column, and 3x3 box.

Fog: The grid is partially covered in fog. Placing a correct digit might clear some of the fog somewhere in the grid. No guessing is required.

Circles: A digit in a circle indicates roughly how many circles contain that digit i.e. X in a circle indicates that X appears in either X+1 or X-1 circles (but not in exactly X circles). All circles are visible i.e. no circles are hidden behind fog.

Entropy: Orthogonally adjacent circles must have different entropy i.e. a digit from a different set {1, 2, 3}, {4, 5, 6}, or {7, 8, 9}.

Arrows: Digits along an arrow sum to the digit in the attached circle.

SudokuPad