WPF Sudoku Grand Prix

A big online sudoku event is coming and the winners will be invited to the next World Sudoku Championships in Beijng. We’ll copy-paste the information about this event from the official page (http://www.worldpuzzle.org/events; registration form is on the same page):


WPF is happy to announce the 1st WPF online sudoku tournament – WPF Sudoku Grand Prix

The tournament consists of eight rounds organised by WPF members from eight countries. The hosts will be Czech Republic, Germany, India, Italy, Serbia, Turkey, UK, USA. The dates will be announced soon.

All the sudoku players can take part and compare their results with the top players without leaving their home.

In the next days the registration will be launched at our web page. Only registered players will be included in the final WPF ranking.


  • January – Czech Republic – Jan 25-27
  • February – India – Feb 9-10
  • March – Germany (or late Feb.) – Feb 23-24
  • April – Serbia – Apr 20-22
  • May – UK, US
  • June – Italy
  • June – Turkey – Jun 22-23

Basic facts

  • There will be 8 online tournaments starting in January 2013 and ending in July 2013
  • The WPF will maintain official rankings of the registered players
  • Registration and player rankings will be done on the WPF web page
  • Only 6 out of 8 tournaments will be included into the final rankings, each player will get to choose which of his or her 6 scores will count
  • At the end of the series, the 10 players with the highest cumulative scores will be invited to the next WSC to play off in person
  • For the first year there will be no registration fee, players may participate for free
  • Each of the top 10 players will receive a 100 EUR discount off the cost of attending the next WSC
  • Each tournament will be available for an entire weekend



A few event dates have been set. The schedule has been updated with relevant data.

Introducing the new Mindoku game client


Mindoku Team has been working on a completely new game client for the past few months and today we are releasing the first beta version of it. Beta means that it should work nicely but might still have a few bugs.

Our first game room that the new client supports is Othello:


As you can see the new client looks and behaves similarly to the old Java applet version but has a few very important differences/improvements over the old version:

  • It utilizes modern web standards (HTML5, Web Sockets, Canvas, etc) which are supported by modern browsers and therefore does not require any external plugins to work. It is very lightweight and starts instantly when you open up a game room. No more waiting until the browser launches the heavy Java Runtime Environment which is needed by the old game client.
  • Soon you’ll be able to play in Mindoku with your tablet or a smartphone. Browsers for the mobile operating systems (iOS, Android, etc) do not support Java applets but they support new web standards and that makes it possible to use the new client on regular computers and also on mobile devices.
  • The development is much simpler with the new client which means new features or changes can happen faster.

What are the modern browsers that support our new game client you ask? There are currently three of them:

  • Mozilla Firefox version 11 and up
  • Chromium version 16 and up (Google Chrome, SRWare Iron, etc)
  • Safari version 6 and up
Other major browsers that do not support these web standards yet but will add support in the future:
  • Opera starting from the version 12.10
  • Internet Explorer starting from the version 10

Currently only Othello gameroom supports the new client but we will be gradually adding support for other games too. The current game client that is built using the Java technology will be slowly phased out. You’ll still be able to use the Java applet client for some time but we won’t be adding new features to it.

We encourage you to try out the new client and let us know if you encounter any bugs. You can also tell us which game would you like implemented next with the new technology!


Mindoku Team


UPDATE: Opera has now released the version 12.10 which means that IE is the only major browser that has yet to implement support for previously mentioned web standards.

Play Gomoku and Othello against a computer!


We added a possibility to play Gomoku and Renju and Othello against a computer. To challenge a computer, just go to the gameroom and invite a user named “Computer” to play. There are two computer users in both gamerooms.


The reasons why we created this possibility are as follows:

  • To create an option for beginners to try the games out without a risk of losing rating points.
  • Possibility for advanced players to spend time when there is nobody else in the gameroom. You can also challenge yourself to find out how many moves you need to win the computer or if you could fill the whole gametable with buttons 🙂

There are only two computer players in those gamerooms because we prefer human players to play with each other (if there are 3 or more users) rather than with computers.

In the near future we’ll add this possibility also to:

Stay tuned!


Mindoku Team

Non-consecutive Little Odd Fish Killer Sudoku

There are lots of different types of sudoku that are developed every year. It’s possible to keep the look of a regular sudoku and add some rules that will give totally new dimensions to these sudokus. As much as there are sudoku types, there are the same amount of different names to them.

The name of a sudoku has to tell you what it’s about. For example, if the name is non-consecutive sudoku, then there is an extra constraint that consecutive digits cannot be next to each other.

There is a competition at the logicmastersindia.com website this weekend until tuesday, and it’s all about killer sudokus. Killer sudoku is a sudoku that has extra areas in which the sums of all digits must match a specific number. The competition is about some new variants created by Stefan Heine from Germany who is one of the best sudoku constructors in the world (in my opinion). It’s worth to give it a try, because this competition has some style.

The name of a competition is Killer Shootout and sudokus in this competition consist of birds, fishes and compasses. One of the sudokus there has the coolest name I’ve ever seen: Non-consecutive Little Odd Fish Killer Sudoku. You can see the sudoku here:

Non-consecutive Little Odd Fish Killer Sudoku

There are some extra constraints and the name actually tells you what it’s about. It’s non-consecutive, there are some fishes where you can only write odd digits and it’s a variant of a killer Sudoku named little killer. The numbers outside the grid provide the sums of all digits in the indicated diagonal direction. Awesome!

I am participating in this event and hope to see you there!




Mindoku Team

New feature: Sudoku records


Now that the summer is slowly coming to an end, we will start rolling out updates and new features in a faster pace. The first one after two months of leisure time is sudoku records!

Here is a little piece of the new page:


It shows Mindoku’s fastest sudoku solvers and some interesting statistics. This example above are 9×9 easy sudoku records. In addition to the above visible columns, you’ll also be able to see the average solving time, when the record was achieved, how many sudokus has the user solved and the solving percentage (solved vs started sudokus).

Go ahead and check it out: sudoku records! (you’ll see the link to the records page on the games index page and in sudoku gameroom)


Mindoku Team

New game: Lines Of Action!

We have a new board game: Lines Of Action!


The objective of the game is to bring all of one’s pieces together into a contiguous body so that they are connected vertically, horizontally or diagonally. This game is in the programme of the Mind Sports Olympiad and is very popular among the participants.

Lines Of Action – go ahead and give it a go!


Mindoku Team

P.S. The rules of the game can be found on the game page under the game applet.

P.S.S. Check out our Facebook page too and feel free to comment there.

Irregular Sudokus have arrived!


We just uploaded a major update to sudokus. Namely, you can now solve irregular jigsaw sudokus, 9×9 and 6×6 variants.

Here’s an example of a medium difficulty 9×9 irregular sudoku:


In addition to these new sudoku types, there are also changes in sudoku tournaments. There are now three different levels of sudoku tournaments: easy, medium and difficult. They comprise of the following sudokus:

Easy sudoku tournament:

  1. 6×6, easy
  2. 6×6, easy
  3. 6×6, medium
  4. 6×6, medium
  5. 9×9, easy
  6. 9×9, easy
  7. 9×9, medium
  8. 9×9, medium
Medium sudoku tournament (same as previously):
  1. 6×6, medium
  2. 9×9, easy
  3. 9×9 diagonal, easy
  4. 9×9, medium
  5. 9×9 diagonal, medium
  6. 9×9, difficult
  7. 9×9 diagonal, difficult
  8. 9×9, very difficult

Difficult sudoku tournament:

  1. 6×6 irregular, medium
  2. 9×9, medium
  3. 9×9 diagonal, medium
  4. 9×9 irregular, medium
  5. 9×9, difficult
  6. 9×9 diagonal, difficult
  7. 9×9 irregular, difficult
  8. 9×9, very difficult

Our daily sudoku tournament will be the same as before – medium difficulty. However, you can now create your own tournaments with a difficulty of easy, medium or difficult.

So, enough talking, head on to the sudoku room and check out the new sudoku types!


Mindoku Team

P.S. Feel free to discuss this update in the forum.

Baltic online tournament in Draughts starting this Sunday!

Our first online tournament series in 10×10 Draughts and Russian Checkers for Baltic players starts this Sunday, on June 3rd.

Here is a reminder of the schedule:

Russian Checkers: every Sunday in June at 20:00 EEST (Eastern European Summer Time). That is 17:00 in UTC.

The dates are:

  • June 3rd
  • June 10th
  • June 17th
  • June 24th

10×10 Draughts: every Thursday in June at 20:00 EEST (Eastern European Summer Time). That is 17:00 in UTC.

The dates are:

  • June 7th
  • June 14th
  • June 21st
  • June 28th

You can also take a look at the tournament announcment post for more info.

See you in the tournament room on Sunday!

Mindoku Team