Sudoko brain training

Description This is a model for brain training through the Sudoku game.   Game Rules: You place the game board; The black numbers are used to be placed on the board before the game starts and they do not move anymore; Sudoku is solved with the yellow numbers according to the following rules: 3.1 Each row must contain the numbers from 1 to 9, without repetitions 3.2 Each column must contain the numbers from 1 to 9, without repetitions 3.3 The digits can only occur once per block (nonet) 3.4 The sum of every single row, column, and nonet must equal 45. The black numbers are used to be placed on the board before the game starts and they do not move anymore; Sudoku is solved with the yellow numbers