by Jakhob and wooferzfg

This puzzle is a variant of U-Bahn.

If you are unfamiliar with U-Bahn, here is a guide that covers the core logic.


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

A clue outside the grid indicates how many times the corresponding line shape (i.e. a cross, branch, straight line, or turn) appears in the corresponding row or column, irrespective of the line shape's rotation.

6x6 Example Puzzle

Play the Example on Penpa+

Play the Example on SudokuPad

Puzzle Links

Play on Penpa+

Play on SudokuPad