Logic Masters Deutschland e.V.

Normal sudoku rules apply.

German whispers: Adjacent whispers on a green line must have a difference of at least 5.

Loop: Draw a 1-cell wide loop of orthogonal cells. The loop may not touch itself (not even diagonally).

Circles/squares/diamonds: Circles are on the loop, squares are outside the loop, and diamonds are inside the loop. A digit in one of these shapes counts how many cells of the same type (loop/outside/inside) it sees in the row and column, including itself. The other types block vision.

Consecutive sum segments: The box borders divide the loop into segments. If the loop enters the same box multiple times, these are counted as separate segments. The sums of these segments forms a consecutive sequence of values, which can appear in any order along the loop.

CtC App: Link

F-puzzles: Link