Question

What is difference between rectangle and unique rectangle?​

Answer 1

Answer:

A Unique Rectangle is a Deadly Pattern formed by 4 cells that share 2 rows, 2 columns and 2 boxes. In Sudoku Variations with additional constraints, each of these constraints must either contain 2 cells or none at all. All 4 cells only have candidates for the same 2 digits.

Answer 2

Answer:

a rectangle will be having 4 sides and the opposite sides will be equal

andunique rectangle is found in sudoku