In order to complete an NYT SUDOKU puzzle, a 9x9 grid must be filled with numbers so that each column, row, and 3x3 square contains a number from 1 to 9. The 9x9 grid will have some squares filled in at the start of the game. Your task is to complete the grid by adding the missing digits logically. Remember that a move is improper if: 1. More than one of the same numbers from 1 to 9 can be found in any row. 2. From 1 to 9, any column contains several occurrences of the same number. 3. Any 33 grid from 1 to 9 contains multiples of the same number.