Here at Chalkdust HQ, we love inventing ways to make Sudoku-style puzzles more interesting. This week, I will be sharing some 3D puzzles, which I call Cuboku.
To build a Cuboku, start with a small Sudoku made of four 2×2 squares as opposed to nine 3×3 squares. To make the visualisation in 3D easier, I will be using four different colours (red, green, blue, yellow) instead of numbers. The usual rules apply: you cannot put the same colour twice in any of the vertical or the horizontal lines or in any of the four 2×2 squares. A completed Sudoku may look like this:
Now, you only have to pile up four of these Sudoku to obtain a cube — except that the slices along each axis also have to satisfy the rules of Sudoku! So you now have to solve 12 (4×3) Sudoku! A completed Cuboku may look like this:
12 Sudoku are formed (the transparent cube has been added to demonstrate how the different slices relate to each other):
Now for the puzzles:
The First Puzzle
Now that we are all set up with the rules and how to play this fabulous game, let’s start with
the first puzzle: complete the rest of the Cuboku.
Now that you have a little practice solving Cuboku, here’s two more challenging puzzles:
It’s All About the Corners!
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- We spoke with Jonathan Farley about his research and experiences as a black mathematician.
- As part of Black Mathematician Month, we spoke to the Bristol University professor about access schemes and the importance of mentors.
- Meet Olubunmi Abidemi Fadipe-Joseph, an active promoter for women in mathematics from Nigeria