Logic Masters Deutschland e.V.

After setting 2 hybrid U-Bahn puzzles, I wanted to try something with only U-Bahn clues. I had the idea of trying to set on a toroïdal grid, to introduce a fun twist on how some clues will work. It was only when I was done setting the puzzle that I was made aware that it had been done before. As always when you think you discover a "new" idea, there's a good chance someone had the same idea before you ! So, here is my take on that "not-so-new" U-Bahn variant ! Very approachable if you already know your way around U-Bahn logic in my opinion. Enjoy :)

The puzzle :

Play on Penpa (answer check with normal green lines like in the example puzzle below)

Rules :

Toroïdal grid : The 9x9 grid works as a "cylinder" both horizontally and vertically, i.e. each cell of the leftmost column is considered adjacent to the cell sharing the same row in the rightmost column, and each cell of the upper row is considered adjacent to the cell sharing the same column in the lower row.

U-Bahn : Draw a loop network through the centers of some cells, which may branch or turn, but may not have any dead ends. Clues to the left and above 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.

Example puzzle :

Play on Penpa (answer check)