Delhi, July 3, 2021: Sudoku Class Activity was organised on 3rd July 2021 for classes IV and V. Sudoku puzzle is an excellent tool for building student’s critical thinking skills. Students use the given numbers to help them fill in the blank squares so that each number, 1 to 9, appears in every column, row, and block of the completed Sudoku puzzle. All the students participated enthusiastically and enjoyed this activity.