A 4x4 Sudoku puzzle is a grid where the objective is to fill the empty boxes with a single digit from 1 to 4. The rules require that each digit can only appear once in a bolded box, each row, and each column. Consequently, the numbers must total 10 in each bolded box, row, and column.

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Sudoku is a type of puzzle commonly used as a mental exercise to improve problem-solving skills. The objective is to fill a grid, which is typically 9x9, with digits so that each column, row, and sub-grid contains each digit only once, adhering to a set of rules.

Sudoku Puzzles as a Mental Exercise

Spielman, R. M., Jenkins, W. J., & Lovett, M. D. (2020, April 22). Psychology (2nd ed.). OpenStax. https://openstax.org/books/psychology-2e/pages/1-introduction

OpenStax Psychology (2nd ed.) Textbook

An example of a simple Sudoku puzzle is a 4x4 grid with some numbers pre-filled. In one such puzzle, the initial configuration includes the number 3 in the top-left corner, 2 in the top-right, 4 in the bottom-left, and 1 in the bottom-right. The central 2x2 block is also partially filled, with 4 in its top-left position (row 2, column 2), 1 in its top-right (row 2, column 3), 3 in its bottom-left (row 3, column 2), and 2 in its bottom-right (row 3, column 3).

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