Logic Masters Deutschland e.V.

Mini-Colossal Octoquadri II: U-Bahn

Part of a greater collaboration with MaizeGator, in which we are setting pencil puzzle octoquadri hybrids in the "colossal sudoku" format.

Puzzles in our series so far:
Mini-Colossal Octoquadri I: Loop 12 (MaizeGator).
Mini-Colossal Octoquadri II: U-Bahn (sfushidahardy).
Mini-Colossal Octoquadri III: Sukoro (sfushidahardy).

• Octoquadri: Place 8 of the digits 1-9 in the "Octoquadri" grid, so that every digit occurs twice, and there are no repeats in any row, column, or box. Place the remaining digit in the "Leftover" cell.
• U-Bahn: Draw a connected loop network through the centers of some cells in both grids, which may branch or turn, but may not have any dead ends. Clues indicate how many times the corresponding line shapes (i.e. crosses, branches, straight lines, or turns) appear in the corresponding row or column, irrespective of the line shape's rotation.
• Assign the values "1" to turns, "2" to straights, "3" to branches, and "4" to crosses. In the Mini-Bahn grid, every line shape must agree with the digit in its cell (modulo 4). For example, if the Mini-Bahn network visits a cell containing a 7, that cell must be a branch. To clarify, not every digit (cell) of the mini-Bahn must be visited by the network.
• Interaction: Each cell in the Octoquadri grid corresponds to a 3x3 region in the Mega-Bahn grid. Each Mega-Bahn region contains 12 dotted edges. The digit in each Octoquadri cell is the number of dotted edges crossed by the U-Bahn network in the corresponding region.

I hope you enjoy the puzzle!