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Members' frequently asked questions

If you have a question about Sudoku puzzles themselves, please see our Sudoku FAQ.

New accounts and updating your details

Why does my account not work?

All accounts must be verified before you can use the Sudoku generators and solvers. You will have received a welcome email containing your account details. Simply follow the instructions in your email to verify your account.

Why do you need to verify my email address?

Valid email addresses are vital for a number of reasons.

  • Firstly, we can only send you a copy of your account details to you if your email address is working.
  • Secondly, any generated or solved Sudoku will be emailed to your account address by default. If this address does not exist, then you lose your Sudoku.
  • Finally, many members would like to receive news from Sudoku Generator delivered to their email inbox. Obviously, if the email address is bad, you will miss out here.

How do I change my email address?

You can change the email address for your account in your profile.

Your new email address will need to be verified, by clicking the button in the verification email that you receive, to complete the process.

Why do you close some accounts?

Any accounts created with invalid details for the name or email address will be removed.

You may only have one free account per person; multiple accounts will be removed. If you wish to generate more Sudoku puzzles per day, please consider upgrading to a full account.

If the email address listed in your account no longer works, your account may be removed.

People who continually create multiple free accounts or continually enter invalid details will be banned. Anyone found breaking our copyright guidelines will be banned.

How do I delete my account?

If you wish to delete your account, you can do so here. Please note that this will permanently remove your account.

However, if you only wish to unsubscribe from receving newsletters, simply untick the newsletter option in your profile. If you only wish to stop receving Daily Sudoku emails, please update your Daily Sudoku preferences.

Other account issues

Why does it say I have reached my daily limit? I have not used my account today.

The days are measured in UK time. New days will begin at around 7 pm in the US, and 11 am in Australia, depending on your time zone.

Why can’t I stay logged in?

There is a cookie problem if you are continually redirected to the login page after you have logged in. You need to enable session cookies in your browser.

How do I enable session cookies?

In Internet Explorer, go to Tools | Internet Options | Privacy | Advanced... then tick "Override automatic cookie handling" and then tick "Always allow session cookies". Other browsers will have this under Tools | Settings | Cookies.

Using the Sudoku generators and solvers

The Killer Sudoku generator or solver is blank / I am unable to view Killer Sudoku on my computer

Flash is required to view the Killer Sudoku generator and solver.

Firstly, please make sure that you have the most recent version of Flash installed in your browser. You can download Flash Player from the Adobe website.

Secondly, if Flash is already installed and up-to-date, please ensure that Flash is enabled in your browser. In Firefox this means ensuring that the Flash add-on is enabled.

I am unable to view the Killer Sudoku generator or solver on my iPhone or iPad

The Killer Sudoku generator and solver are displayed using Flash. Unfortunately Flash is not currently supported on the iPhone or iPad, so you will need to use a computer to access these.

Why does my Sudoku puzzle print out larger than it did before? It is now too large to fit onto the page.

You may have changed your print settings in your browser. Please try reducing the scale of the print page slightly. In Firefox, go to File | Page Setup to adjust your print page scaling.

My Sudoku puzzle doesn't print out correctly - some numbers are in the wrong place / on top of each other / not within the grid

It is probably the case that the zoom is not set to 100% in your browser. In Firefox, you can reset the zoom to 100% by going to View | Zoom, then click 'Reset'. Alternatively, simply press Ctrl + 0.

About Sudoku puzzles created at

What can I do with my Sudoku?

You have many options open to you. You may print your generated Sudoku to take with you on a train journey, for a long Friday at work or for a lazy afternoon in the park. Whenever you have some free time, you can keep your mind busy with a couple of Sudoku at hand.

If you wish to take part in a newspaper competition, you may solve a Sudoku and email it to yourself. From here, you will be able to forward it on to the competition email address. If you want to take part a postal entry, simply print off your Sudoku and send it in.

You may not sell Sudoku puzzles generated here in any form. They may not be used on any external website or publication without prior permission. If you are unsure about our Sudoku copyright, please contact us.

If you wish to publish our Sudoku puzzles on your website or in your publication, please see our Sudoku Syndication page for more information.

My Sudoku is invalid with multiple solutions.

Your Sudoku has not been generated at Sudoku Generator. All of our Sudoku, Super Sudoku and Samurai Sudoku puzzles are verified before display. In addition, the Sudoku generator program only uses varying levels of logic to create the puzzles. Guessing is not logical, guaranteeing that all the Sudoku here are unique.

If you are using the Sudoku solvers, multiple solutions simply reflect badly on the source of the Sudoku.

I would like to use your Sudoku in my publication.

We provide Sudoku for many different publications around the world, please view the Sudoku Syndication page for more information. Please contact us today and see what we can offer you.

Other common questions

What is the newsletter?

The newsletter will simply contain Sudoku Generator website news, general Sudoku news, information on competitions and Sudoku freebies.

We will not bombard your email inbox with endless promotions as this is simply annoying to everyone. Our newsletters will never be sent more than once a month and your email will not be given to anyone else.

How may I contribute?

At the moment we are looking for a number of user contributions that you may wish to partake in. Anyone that provides a useful contribution will be entitled to a free account upgrade.

  • General site suggestions would be very welcome.
  • Offers of prizes or prize suggestions for future Sudoku Generator competitions.
  • Links to other genuinely interesting Sudoku websites.

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