Ever seen your friend scribbling numbers into a square grid? They’re not solving a math problem; they’re playing sudoku. And, in this article, you’ll learn about this logic-based number game, alongside some practical tips on how you can play this brain-boosting puzzle.
Related:
- Mastering Wordle: 6 Strategies to Keep Your Streak Going
- 10+ Games Like Wordle
- Random Icebreaker Questions Generator
What Does the Word Sudoku Actually Mean?
The name “Sudoku” is a Japanese abbreviation for “Sūji wa dokushin ni kagiru.” This means “the digits must be single” or “the numbers must occur only once.”
Fun Fact: There’s no exact English equivalent for the word “Sudoku.”
What Is the Origin of Sudoku?
So, where did sudoku come from? Surprisingly, its roots trace back to 18th-century Switzerland.
Mathematician Leonhard Euler developed a concept called “Latin Squares,” which inspired the logic behind sudoku.
However, the version we recognize today—with its 9×9 grid and subgrids—was first published in 1979 in a New York puzzle magazine under the name “Number Place.
Then, in 1984, a Japanese puzzle company named Nikoli brought it to Japan. They named it “Sudoku.”
Another fun fact: The worldwide success and popularity of sudoku surged in the early 2000s.
How Does Sudoku Work?
As we’ve mentioned earlier, sudoku is not a math problem, so put those calculators away!
Sudoku features a 9×9 grid split into nine smaller 3×3 grids. Some of the grids already have a printed number, while others don’t. Your goal? That’s to fill the empty squares using numbers from 1 to 9.
Sounds simple, right? Think again. The numbers 1 to 9 should only appear once (remember, Sūji wa dokushin ni kagiru or “the numbers must occur only once)” for each column and row.
Does Playing Sudoku Increase Your IQ?
Now, since sudoku is a logic game, there’s a misconception that it can magically increase your IQ. We’re sorry to break it to you. Ssudoku doesn’t increase your IQ.
The good news is that playing this number game offers fantastic benefits to your brain. And, we’re not making that one up! A study published in the International Journal of Geriatric Psychiatry found that adults who regularly played word and number puzzles, such as sudoku, performed better on cognitive tests. This was especially true for memory and processing speed.
What Are the Rules of Sudoku?
Sudoku may appear complicated, but it has only two simple rules. Once you’ve mastered these, you’re ready to play!
Rule #1: Each Row and Each Column Must Have Numbers from 1 to 9
Imagine the grid. It has nine horizontal rows. It also has nine vertical columns. In each row and column, you must place the numbers one through nine.
Rule #2: No Number Repeats for Each Row and Column
This rule simply clarifies Rule #1. It’s very important. You can’t use a number twice in the same row. You also can’t use a number twice in the same column. Each digit from 1 to 9 gets one spot —yes, only one spot.
How to Play Sudoku
Now that you know the rules, it’s time to start playing sudoku! Here’s how to start:
- Scan for Obvious Numbers: Look at the grid. Find numbers that appear often. For example, if there are many 4s.
- Focus on a Single Number: Pick one number, say 4. Look at all the 4s already in the grid.
- Use Elimination in Rows and Columns: See which rows and columns the number (let’s say 4) already occupies. This eliminates those spots for other 4s.
- Target a 3×3 Block: Now, look at a 3×3 block that needs a 4. See which rows and columns within that block are already taken by a 4 from outside. This usually leaves only one possible spot for the 4 in that 3×3 block.
- Fill and Repeat: Once you’ve placed your number (like 4), it becomes a new clue that may help place others. Then, repeat the process with a new number or focus on a nearly complete section.
Pro Tip: Each row, column, and 3×3 block adds up to 45 when completed correctly. So, if your sum isn’t 45, then you’ve made a mistake.
Tips and Tricks to Solving Sudoku Puzzles
Once you’ve got the basics down, these strategies can help you tackle tougher puzzles.
- Pencil Marks are Your Friend: Don’t be afraid to write tiny “candidate” numbers in the corners of cells. These are all the possible numbers that could go in that square.
- Look for Hidden Singles: Sometimes, a number can only go in one cell within a row, column, or block—even if other cells seem possible at first glance. These are called “hidden singles” and are easy to miss without pencil marks.
- Spot Naked Pairs/Triples: If two cells in a row, column, or block only have two same candidates (e.g., both could be 2 or 5), you have a ‘naked pair.’ This pair must go in those two cells. This eliminates 2 and 5 as candidates in other cells in the same row, column, or block. The same logic applies to three cells with three shared candidates.
- Take a Break: If you’re stuck, take a break for a bit. You’d be amazed how often the solution pops out when you’re not staring at it.
Final Thoughts
And there you have it! Sudoku provides an engaging brain workout, combining logic and pattern recognition without complicated rules. Just fill the 9×9 grid so that each number from 1 to 9 appears once per row, column, and 3×3 block—and you’re done!
