Doomsday Algorithm Rule for Escape Rooms - Day of the Week Calculator

$ 32.00

Yes - Please enter in custom information in the "Special Instructions for Seller" Box at checkout
INTL Shipping FAQ

The Doomsday Algorithm or Doomsday Rule is technique which always you to determine what day of the week a future date will be in seconds.

With this device you can discover what day of the week it was or will be for any date between 1901 and 2099. Just think of the possible applications for this prop in an escape room.

A date can be in the room somewhere, with this that date can be translated in to a day of the week which then reveals a clue/solves a puzzle/who knows what?! Another, more complex application of the Doomsday Algorithm is turning it into a cipher.

Somewhere in the room you can have a key which translates the days of the week into letters. By providing players with dates they can find the correlating day of the week which in turn equals a letter (or number) determined by you. Once the players discover all of the days they can use your key to translate them in to a word and/or number set.

A bit of background on the Doomsday Algorithm:

John Conway, UK mathematician, in 1973 developed a technique where a bright person with a little practice can within seconds determine the day of the week for any given date.  You can read more about this by doing a search on “Doomsday day of the week “ on internet or Youtube.  It’s a fascinating topic.

This device takes those math concepts and converts them to a physical device that anyone can use. 

It is a high quality item 5.8” in diameter made from top grade maple veneer MDF for strength and beauty.  The top disk is alder.  All lines are precision laser engraved and it turns on a ½” center dowel.  It should last a lifetime.

The complete instructions on how to use it are lasered on the back, so you don’t have to worry about losing the instructions. This is also helpful in an escape room as they will just have to flip it over and be able to understand how it is used. 


A lot of our puzzles can be customized with different images, text, symbols and codes.

If you are placing an order for any puzzle which requires a code such as:

  • Magnet Maze
  • Disk Maze
  • Directional Lock Puzzle
  • Grille Cipher
  • Holey Moley
  • Braille Box

Please select "Yes" to customization and Email me the code.

All Magnet Mazes require a code from you, the other puzzles will have a standard code used if a custom code is not selected.

International Orders Please Email me the code at

There is not an additional charge for a custom code on Magnet Mazes. There is a small fee for customizing the puzzles.

It is very important to relay codes for mazes and any custom information to me at the time of your order.

I cannot get started until knowing exactly what you want. If I do not have this information it will increase the amount of time it takes for you to have the puzzle in your hands.

If you would like to add images or more extensive customization please contact me prior to placing your order so we can work out the details. 

I can also create custom one off props to fit in with the exact needs of your room. If you have an idea please do not hesitate to contact me. We may just be able to bring it to life.



INTL Shipping FAQ Ships Worldwide

Please note international shipping times have been effected by Covid-19. Not all shipments will be impacted; however, there is a chance your order will experience a moderate to significant increase in transit time. If it seems your package is taking longer than normal be sure to check the tracking link and contact your local Post.

Please see below for for a Q&A conducted among me and myself regarding International shipping. If you have any additional questions or need clarification please contact me directly

Q: Do you ship your escape room puzzles internationally?
A: Yes! We should all around the world.

Q: What is the cost of international shipping?
A: Cost will vary depending upon the overall weight of your order. Fortunately, we have a fantastic partnership when it comes to international shipping rates which will save you money.

Q: How do I take advantage of your discounted international shipping rates?
A: It is very easy. Simply select your country from the pop-up window or the dropdown box at the top of the page. This will translate the site to your native language and currency. Not only will this activate the international shipping platform, but allow you to browse our site in your language and currency.

Q: How long does it normally take for international shipments to arrive?
A: Travel time varies country to country. Expect around 15 days.

Q: I can't wait that long is there any option to receive my puzzles faster?
A: Indeed there is. If you do not mind paying more for shipping I can have them sent via DHL. The shipping time for this service is normally 2-5 days. If you would like to use this shipping option please contact me directly as it is not available through the website. 

Q: What about Customs?
A: Each country handles Custom's duties differently. If you are concerned over what the duty may be on your order I suggest checking your Country's rates prior to completing your order. 

Q: How much will Customs cost?
A: This also varies with each Country. It is important to note you as the receiver of the shipment are responsible for paying any and all taxes/duties/fees imposed by your Country. I/Creative Escape Rooms are not responsible for any taxes/duties/fees imposed by your Country.

Q: How long does it take for you to ship an order?
A: This is a tricky one as it really depends upon what you order. Some puzzles (such as mazes) take longer to make than a cipher wheel or lobby puzzle. Often times I can have an order ready to ship within 5 business days. Other factors such as custom requests/engraving will increase lead time.

Q: Why is my order shipping to Folcroft, PA. I do not even live in the United States?!
A: The address shown in Folcroft, PA is an International Shipping Hub. From there your puzzles will be redirected to you. The confirmation Email sent after placing your order contains another link with more detailed shipping/tracking information. 

Doomsday Algorithm Rule for Escape Rooms - Day of the Week Calculator

Doomsday Algorithm Rule for Escape Rooms - Day of the Week Calculator

$ 32.00
Yes - Please enter in custom information in the "Special Instructions for Seller" Box at checkout