SudokuStation

When you find it hard to identify straightforward answers in Sudoku, then it is time to use candidate numbers. The candidate numbers help in filling out all the possibilities for each empty cell depending on the figures already present on…

The fundamental Sudoku-solving technique known as ‘Last Free Cell’ or ‘Last Empty Cell’ is very popular. It’s easy and involves the simple rule that every 3×3 box, vertical column, and horizontal row in a Sudoku grid has to contain all…

Solving Sudoku starts by following the ‘Last Remaining Cell’ technique, which is one of the most important techniques used by beginners and advanced players. It works on the principle that for every 3×3 box, vertical column, and horizontal row in…

The ‘Last Possible Number’ technique is an effective strategy for beginners in Sudoku. In this method we examine the existing numbers in the puzzle and find the missing number in the 3×3 block, horizontal row, and vertical column. For example,…

This Sudoku solving technique is all about the use of candidate numbers or notes. How does it work? Just write down the possible candidate numbers in each square first. Then, identify those squares which only have one candidate number remaining.…

The ‘Obvious Pairs’ is also called ‘Naked Pairs’. This method is based on the same principle as the ‘Obvious Singles’ technique. Find all possible candidate numbers in each cell and identify pairs of cells within a 3×3 block having similar…

The ‘Obvious Triples’ technique operates on a similar principle as the ‘Obvious Pairs’ method, but instead of looking for pairs, you need to identify three cells that contain the same set of candidate numbers. While this method might seem complex…

The ‘Hidden Singles’ technique is essentially a basic strategy; it also relies heavily on using candidate numbers effectively. The key principle is that a candidate number should appear only once within a 3×3 block. Let’s dive into an example. As…

The ‘Hidden Pairs’ technique builds on the principles of the ‘Hidden Singles’ method, but it’s a bit more advanced. This strategy involves a careful analysis of the candidate numbers in each cell. The key condition for ‘Hidden Pairs’ is to…