Tredoku Patterns

Tredoku is a generalization of Sudoku in which each 3×3 box forms part of the surface of a 3-dimensional stack of cubes. Like Sudoku, the goal is to fill the grid with the digits 1 up to 9 in such a way that each digit appears exactly once in every 3×3 box and in every 9×1 strip. The picture above shows a solved Tredoku grid with three of the 9×1 strips…