Logic Masters Deutschland e.V.

Rules

1. Sudoku: Fill the grid with digits 1-9, so that no digit repeats in the same row, column, or 3×3 box.


2. U-Bahn: Draw a totally connected network through the centers of some cells, which may branch or turn, but may not have any dead ends.


3. Summation: Assign U-Bahn line shapes to numbers (regardless of rotation) as follows:
   • Empty = 0
   • Corner = 1
   • Straight line = 2
   • Branch = 3
   • Cross = 4
   A cell's value equals the sum of its digit and the number for its line shape.
   Clues outside the grid represent the sum of values in each contiguous sequence of cells visited by the loop 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 loop 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.