Quadruple Sudoku (Fun With Sudoku #17)

Quadruple Sudoku is an interesting Sudoku variation that adds special clue sets to the classic Sudoku puzzle. Along with the standard Sudoku rules, each set of four small digits placed at the intersection of grid lines indicates the four numbers that appear in the four surrounding cells. The digits may appear in any order, but all of them must be present. These clues provide valuable information and create many interesting logical deductions throughout the puzzle while keeping the rules simple and easy to understand.

This Quadruple Sudoku was originally created by Ritesh Gupta and Hitesh Gupta for the Indian Sudoku Mock Tests and was later republished in the Fun With Sudoku series. If you enjoy Sudoku variants that reward observation and logical deduction, this handcrafted puzzle offers a fun and satisfying solving experience.

Rules of Quadruple Sudoku

Classic Sudoku Rules apply. In addition, each set of four small digits in the intersection of two lines indicates the digits that are in the four adjacent cells.