Sudoku "Last Digit" technique

Singles are the easiest and most basic techniques for solving Sudoku. The Last Digit is the easiest of all singles methods. The Last Digit is the last number that can be placed to correctly solve the puzzle.

If it is not the last digit of the puzzle, it's a different technique called "Full House". A house is a full set of numbers between 1-9 it can be a column, block, or row.

Example:

We can see that there is only one empty cell that remains in this Sudoku, it is in row 6 column 8 and it is marked with the green circle.

Take a look at the marked cell, the only missing number that can go in this cell to correctly solve this sudoku is 3, so 3 is the last digit.