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Have you noticed it?

You can select between 4 games to practice your brain? Look at the top left corner and you will see “” selected by default. Right next to it, there are 4 small icons for Klondike, Freecell, and, so you can play all 4 favorite brain games in one place!

sudoku kingdom, solitr, mahjongg, freecell, klondile

Sudoku Kingdom gameplay

Click a cell to select it, then press the keyboard number you want or click the number in the button bar. To clear a cell – select it and then press “backspace”. To take notes, first, you should select a cell and then click the small numbers inside it. Alternatively, you can click on the notes button (bottom right corner) and then click the number or press the keyboard number.

Keyboard shortcuts:

  • use the  arrows to navigate the cells
  • press 1-9 keyboard key to enter the digits
  • use backspace to delete a number or a note
  • Press “N” to enter the notes mode and then enter the note number
  • “Shift” + 1-9 to take notes, without changing the modes (For Mac users it is caps lock)


  • Simple and clean interface
  • Notes – you can take notes
  • Marked in red duplicate numbers
  • Sudoku has 4 difficulty options – Easy, Medium, Hard, and very hard

How to play Sudoku Kingdom?

Sudoku Kingdom – the objective of Sudoku is to fill in a 9×9 grid with digits so that each row, each column, and each 3×3 sub-grid section (also called blocks and regions) contain all the numbers between 1-9 without duplicates (i.e. you can have number 9 only once per row, per column and 3×3 region). At the beginning of the game, you will have a 9×9 grid with pre-filled numbers. By using logic, your goal is to fill in the missing digits so as to complete the grid. To wrap-up, a move is incorrect if:

  • A column contains two or more numbers between 1 to 9
  • A row consists of two or more numbers between 1 to 9
  • A 3×3 sub-grid contains two or more numbers between 1 to 9

Sudoku rules

Sudoku Tips

    • Start by looking for columns, rows, or 3×3 sub-grids that contain 5 or more numbers. Try to fill in the empty cells by checking the non-used numbers. More often than not, you will find out that only 1 number can fill in a particular cell, without breaking the rules.
    • Sole candidate – look for a cell that can only contain a specific number. This happens whenever all other numbers but the candidate exists in either the current sub-grid, row, or column.
  • Elimination – Try to spot cells in which a particular number cannot be used.

About Sudoku

Sudoku is one of the most popular puzzle games which uses logic to solve a combinatorial puzzle. The goal of Sudoku is to fill a 9×9 grid with numbers so that each column, row, and 3×3 region contain all of the digits between 1 and 9, without using the same number more than once. Completed games are always a type of Latin square. The modern Sudoku was most likely designed anonymously by Howard Garns, a 74-year-old retired architect, and freelance puzzle constructor and first published in 1979. The puzzle was introduced in Japan by Nikoli in the paper Monthly Nikolist in April 1984 under the translated name “the digits must be single”. The game quickly became popular after its introduction to Britain and the USA in 2004.

As a logic puzzle, Sudoku is also an excellent brain game and if you play Sudoku daily, you will start seeing improvements in your concentration, memory, and overall brain power.

Variants of Sudoku

  1. Grid sizes variations – The 9×9 grid with 3×3 regions is the most common and popular variant. However, many other variations exist, such as 4×4 grids with 2×2 regions; 5×5 grids with pentomino regions and 6×6 grid with 2×3 regions, and a 7×7 grid with six heptomino regions and a disjoint region. There are Larger grids, too – The Times offers a 12×12-grid  called “Dodeka Sudoku” with 12 regions of 4×3 squares. Dell Magazines publishes 16×16 “Number Place Challenger” puzzles, and Nikoli offers 25×25 “Sudoku the Giant” behemoths. 
  2. Killer Sudoku – combines elements of Sudoku and Kakuro
  3. Kaodoku – it uses partially given smiley faces instead of digits. There are 3 possible shapes and 3 possible smiles for 9 unique combinations.
  4. Alphabetical Sudoku – often called Wordoku – uses letters instead of numbers. Some variants consist of a full word in the main diagonal, once the Wordoku is solved.
  5. Hyper Sudoku – uses the classic 9×9 grid with 3×3 regions, but there are 4 additional interior 3×3 regions in which the numbers between 1 to 9 must appear exactly once.
  6. In Twin Sudoku  2 regular grids share a 3×3 box. This is one of many possible types of overlapping grids. The rules for each individual grid are the same as in normal Sudoku, however, the digits in the overlapping section are shared by each half, and in some variants, neither individual grid can be solved alone.

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Moreover, here you can find and play other puzzle games, namely Solitaire or to check out the top 5 free MSN games, or the top 10 addicting games.