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Welcome to

This was the first site with a playable hyper-sudoku game on the planet. It was developed by an Australian, Chris McCusker, in 2006 and the first online games were played in early 2007. You are welcome to come and play online for free. With over 800,000 unique games available every day. We hope you enjoy the game.

What is hypersudoku?

Hypersudoku is a variation on sudoku, a very addictive game that has taken the world by storm. It has also been referenced as hyper-sudoku, windoku, hyper sudoku, four square sudoku and NRC sudoku(Dutch news paper - NRC). If you like sudoku why not try your hand at hyper-sudoku. The aim of the game is to fill in the grid so that every row, every column, and every 3x3 box (including the blue ones) contains the numbers 1 through 9.

A little bit of history.

Sudoku took an interesting path toward its current popularity. From France to the United States, from Japan to Australia, versions of the sudoku and hyper-sudoku puzzles have come in and out of favour in print publications. The modern sudoku game was believed to be invented by Howard Garns in 1979, a retired architect. It is believed he named the game "Number Place".When it hit Japan in 1986, it was called "Suuji wa dokushin ni kagiru" which they later renamed Sudoku.

It is believed this variation was created by Peter Ritmeester who first publishing it in the Dutch newspaper NRC Handelsblad in 2005. He said "Although there had been variations where certain squares having two roles, like in the x-sudoku, the idea of these overlapping sections adding new logic but keeping the rules transparent and simple, was entirely new."

One year later I included them them in one of our books done with Will Shortz in the USA, who came up with the name "hypersudoku". I used to call them "sudoku extra". In the Netherlands everyone calls them "NRC Sudoku", because the newsparer is very well known".

From everyone at and on behalf of the thousands of players that play this game each week, we would like to thank him for creating such a brilliantly simple and clever game.

The "1st World Sudoku Championship" was held on the 10th and 11th of March 1996 in Italy and is now held annually in different locations around the world. As a progression from sudoku printed roots, Sudoku and hyper-sudoku are now digitally available through the Internet. was the first online hyper-sudoku site to have millions of free online games available.

Hypersudoku is now being served daily in countries including -

Develop your own strategies.

As you play more hyper-sudoku puzzles , you will come up with your own way of playing and preferred stratergies.
Sudoku puzzles are great to use on rainy days, or when the kids are on holidays. Anyone can play hyper-sudoku.

Improve your memory and avoid Alzheimer's disease and dementia.

Have fun and improve your memory and deduction skills. It's an excellent game for development of memory and logical deduction. I noticed at and on a program on television this week they said "Keeping the brain active is thought to build reserves of brain cells and enhance their connections, helping keep you mentally sharp". It said this could be done by playing games like hypersudoku, crosswords, card games etc. and that this could possibly stave off Alzheimer's disease and dementia

So, come back soon and see what its all about. You won't be disappointed. I'm sure you will find it a great challenge.

Back to the game

Learn more about the logic of hypersudoku

Built by BBR copyright 2006