The Ultimate Code Quiz

Test your knowledge of famous codes, hidden rules, secret systems, and mysterious clues from history, science, technology, and pop culture. Think carefully, follow the hints, and see if you can crack them all.

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Last updated: May 20, 2026

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First submitted	May 20, 2026
Times taken	7
Average score	55.6%
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Hint	Answer
Communication in dots and dashes.	Morse code
A British mathematician deciphered this Nazi code.	Enigma code
Restaurants made this code famous.	QR code
Biologists deciphered this code of life, Nature’s programming language.	Genetic code
Clues hidden inside famous paintings, named after a very famous artist also the name of a movie from 2006.	Da vinci code
A secret command for extra powers.	Cheat code
A high-priority emergency signal, also used in the movie A Few Good Men.	Code red
You must follow it before entering.	Dress code
One of the oldest written law systems in history, nearly 4000 years ago.	Code of Hammurabi
A code used at ATMs and phones.	PIN code
A sea code among sailors and thieves, a lawless sea code.	Pirate code
+36 is used for Hungary.	Country code
The code computers use for letters and symbols.	ASCII code
Two or three letters that represent a nation or a code used instead of full country names.	ISO code
A law code created under a Byzantine Emperor, influenced law in Europe for over 1,000 years.	Justinian code
A code based on strength, endurance, and loyalty. A strict warrior code linked to ancient Greek soldiers.	Spartan code of conduct
The warrior code of feudal Japan.	Samurai code/ Bushido code
A French legal code regulating slavery in colonial territories.	Code noir