Sudoku - Proof of Concept

[The Joyful Programmer]

2 and 6 are already used in the cell?


7 goes in middle because 8 is already in that column so 8 goes in corner

You are correct! I added those numbers in there for a couple of reasons.

1. To show you can make mistakes in the game.
   
2. To get people to discuss the project.
   

On a side note, I have implemented the 3rd way of playing Sudoku: