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  Test your powers of logic with these challenging Su Doku puzzles.

  Specially compiled to provide the most deadly Su Doku challenge, this is the only volume for Su Doku enthusiasts who need a puzzle to test their mettle.

  Prepare yourself for the toughest Su Doku challenge there is. These diabolically difficult Ultimate Killer Su Doku puzzles will really put your brainpower to the test as you ‘warm up’ with the 100 Deadly Killer puzzles before steeling yourself to take on the 100 Extra Deadly Su Dokus. Are you ready for the challenge?

  Not for the faint-hearted. The puzzles use the same 9x9 grid as a regular Su Doku, but have an extra mathematical element that multiplies the challenge. The aim is not only to complete every row, column and cube so that it contains the digits 1 to 9, but also to make sure that the outlined sections, called cages, add up to the number given in each cage.

  Warning: Not suitable for amateur puzzlers!

        ABOUT US / TERMS & CONDITIONS:
 

      ABOUT US:

• At GilbosGoods, we're your go-to destination for all things family, offering a diverse array of products to suit every occasion. From stylish fashion and home decor to cutting-edge electronics and thoughtful gifts, we've got it all.

      SHIPPING:

• We are able to provide next day delivery for our orders 99% of the time for orders before noon on week days. However, in some cases the delivery may be slightly delayed due to unforeseen circumstances. Feel free to contact us anytime to ask for a status update on delivery - we always get back to you as quickly as possible. If the delivery is delayed, we give you the option to cancel your order and receive full refund for the item if you prefer. 
• We cannot ship to the following areas: Channel Islands, Isle of Wight, Isle of Man, Scilly Isles, Scottish, Highlands, Scottish Islands, Northern Ireland. This is because our carriers do not allow shipping certain products (e.g. liquids, sprays and batteries) to these locations. In case we receive an order from the above areas, we will still attempt to deliver but cannot guarantee our usual delivery time.

     RETURNS:

• We work hard with all of our customers to ensure that they are getting an excellent shopping experience. Refunds are available for returned items. We accept returns within 30 days from the date you receive your item. If you do have a concern or want to return an item please contact us before opening a return case. Return cases negatively affect selling accounts and we will professionally handle your concerns/returns.

     TERMS & CONDITIONS - PLEASE READ BEFORE BUYING:

• Please note that we are only able to ship to the address provided during checkout. Ensure that the information entered is accurate, as our automated dispatch system does not allow for address changes after the order is placed. Additionally, since orders are processed automatically within minutes, we are unable to cancel them. However, you are welcome to return the item after it has been delivered if needed.
• Our inventory is distributed across multiple fulfillment centers, including Amazon FBA and DK Wholesale. Therefore, your order may arrive in packaging that reflects the branding of one of these fulfillment partners. By placing an order with us, you agree to allow us to share your name and shipping address with these third-party providers solely for the purpose of fulfilling your order.
• We do our very best to make sure every single customer is completely satisfied. If there's a problem, message us! We're always happy to help.