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3D Sudoku (654)
Instruction:
Place a digit from 1-8 in each empty cell in the grid such that each row, column and outlined regions contains each digit exactly once.
This puzzle has 12 lines (instead of rows and columns) and 6 regions. The lines are not straight. The way to identify a line is by taking a cell at the edge of the grid and to follow a path by finding the next cell that touches the opposite side of the cell. You repeat this process until you reach the other edge.