Summation U-Bahn (Knapp-daneben)
(Published on 25. August 2025, 15:36 by goodcity)
Summation U-Bahn : 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.
knapp-daneben : All clues are given off-by-one.
The puzzle is available online via penpa.
Solution code: For each row except the last, from top to bottom, the number of lines leading down from that row.
Comments
today, 00:37 by cyddrdrd
Impressed by the variety of logic applied in this one. Nice and smooth! Thanks!
PS. Can you add "underground" and "Knapp daneben" tags for this one?
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Thanks for the nice comment ! I always forget the tags
yesterday, 14:42 by Playmaker6174
Super fun and rather satisfying solve to unwind! I think this puzzle can also be served for getting familiar with this Ubahn variant :)
on 25. August 2025, 20:02 by damasosos92
Brilliant construction, and PERFECT flow.
on 25. August 2025, 15:50 by Niverio
Lots of fun!
on 25. August 2025, 15:46 by Agent
I'm pleased to see another Summation U-Bahn on the portal! I found it very fun and it has some cool deductions that I didn't know were possible with the genre.
