A friend was in front of me coming out of church one day, and the preacher was standing at the door as he always is to shake hands.
He grabbed my friend by the hand and pulled him aside. Pastor said, “You need to join the Army of the Lord!”
My friend said, “I’m already in the Army of the Lord, Pastor.”
Pastor questioned, “How come I don’t see you except at Christmas and Easter?”
He whispered back, “I’m in the Secret Service.”
Sudoku is played on a square field 9 by 9 of cells. The field itself is divided into regions (3 by 3 squares).
The goal of Sudoku is to fill all the empty cells with numbers 1-9 (one digit per cell), using the following rules:
1. The number can appear only once in each row.
2. The number can appear only once in each column.
3. The number can appear only once in each district.
Simply put, the same number can appear only once in each row, column and region.