Question

How many tetrominoes are used in the formation of given sudoku?

• A. 4
• B. 5
• C. 3
• D. 6

Answer 1

The correct option is A 4

The given sudoku can be obtained by combining the following terominoes in a step wise manner which is shown below.


First combine the light blue and red colour in the manner shown below.


Now, combine the yellow tetromino to the existing figure.


Now combine the green tetromino to the previous figure.


$\therefore$ there are four tetrominoes that are used in the formation of above sudoku.