Theory:

Rules to solve \(4 \times 4\) Sudoku:
  • There are \(4\) rows and \(4\) columns.
  • Each row should be placed with the digits \(1\), \(2\), \(3\) and \(4\) exactly once.
  • Each column contains each digit of \(1–4\) exactly once.
  • Each region(sub-grid) surrounded by thick lines and it can have digits \(1\), \(2\), \(3\), \(4\) once.
Example:
Let us learn how to solve sudoku with the help of following cases.
 
1. Understand to fill the two empty cells.
 
\(4\times4\) Sudoku:
 
2. Fill in correct picture with its answer.
 
sudoku_sea.jpg
 
3. \(4 \times 4\) number sudoku.
 
sudokuGIF.gif