Logic Masters Deutschland e.V.

Rules

1. Slitherlink: Draw a loop that travels along the edges of some cells that does not touch or cross itself. A cell's slitherlink number is the total number of edges surrounding itself that are used by the loop.


2. U-Bahn: Inside the loop, draw a totally connected network through the centers of some cells, which may branch or turn, but may not have any dead ends. A cell's U-Bahn number is determined by its line shape (irrespective of rotations): corner = 1, straight line = 2, branch = 3, cross = 4.


3. Summation: A cell's value equals the product of its slitherlink number and its U-Bahn number. Clues outside the grid represent the sum of values in each contiguous sequence of cells visited by the U-Bahn network, in the order of appearance from left to right or top to bottom. Consecutive sequences must be separated by at least one cell not visited by the U-Bahn network.


4. Cypher: Each letter represents a different digit from 0 to 9. '?' represents any digit from 0 to 9. For a double-digit number, its first digit cannot be 0.

Thank you MonsieurTRISTE and Christounet for testing and suggestions!