Raku Fundamentals: A Primer with Examples, Projects, and Case Studies

© Moritz Lenz 2020

M. LenzRaku Fundamentals https://doi.org/10.1007/978-1-4842-6109-5_3

3. Formatting a Sudoku Puzzle

Moritz Lenz¹ 

(1)

Fürth, Bayern, Germany

 

As a gentle introduction to Raku, let’s consider a small task that I recently encountered while pursuing one of my hobbies.

Sudoku is a number placement puzzle played on a grid of 9×9 cells, subdivided into blocks of 3×3 (Figure 3-1). Some of the cells are filled out with numbers from 1 to 9; some are empty. The objective of the game is to fill out the empty cells so that in each row, column, and 3×3 block, each digit from 1 to 9 occurs exactly once.

Figure 3-1

A Sudoku puzzle in its unsolved form ...