Twin corresponding Sudoku III

Two sudokus in one. Challenge yourself to make the necessary connections.

Age
11 to 16
Challenge level
filled star filled star empty star
Exploring and noticing Working systematically Conjecturing and generalising Visualising and representing Reasoning, convincing and proving
Being curious Being resourceful Being resilient Being collaborative

Problem



Invented by Henry Kwok

 

Twin A



 

Twin corresponding Sudoku III



 

Twin B



 

Twin corresponding Sudoku III



 

Rules of Twin Corresponding Sudoku

The object of this sudoku variant is to fill in each twin puzzle with numbers 1 to 9 so that each row, each column, and each of the nine 3x3 boxes contain all the nine different numbers 1 to 9.



 

This variant consists of a pair of linked standard sudoku puzzles each with some starting digits. To get a complete solution for the twin puzzles, we have to solve each twin puzzle with the usual sudoku strategy but we can only get the complete solution of the twin puzzles by substituting the corresponding values of the digits from one twin sudoku into the other.



 

So, for example, we find that in r4c9, that is row 4 column 9, twin A contains the number 7 and twin B contains the number 4. This means that wherever 7 appears in twin A, it should be substituted by 4 in the corresponding position in twin B and wherever there is a 4 in Twin B there is a 7 in twin A. This immediately gives you some more starting digits in each twin!