Logic Masters Deutschland e.V.

The inauguration of the new underground network in Tokyo was a great success! In fact, the same Japanase architect already sent you the plans for another construction project. Following a new security protocol, the U-Bahn indications have been encrypted. However, if you carefully follow the standard practice of your discipline, you will see that the indications can be deciphered with no ambiguity, and you'll have all the information you need to build the network. Good luck, and have fun!

Rules

• Draw a loop network through the centers of some cells, which may branch or turn, but may not have any dead ends.


• Assign each line shape (irrespective of rotation) a digit from 1 to 4 as follows: corner = 1, straight line = 2, branch = 3, cross = 4. Clues outside the grid indicate the sum of "digits" in each contiguous sequence of cells visited by the loop network, in the correct order. Consecutive sequences must be separated by at least one cell not visited by the loop network. For a given row or column, either all clues or no clues are given.


• Each letter represent a different number. A "?" may represent any number, including two-digit numbers.

Puzzle links

SudokuPad (CTC)
Penpa+