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Challenge

Original Link

Posted on 4 April 2015


PuzzleEdit

This marks our 150th Challenge! Go, Students!

And as always, you'll need knowledge of the past week to solve this.

Sleeping





There is a figure with the letters:

OAMOC
FIQGU
CPSIQ

and the word "MARTES". 

Hint 1

Both the "MARTES" clue and the language it's in are key.


Hint 2

From Tyler Hinman: "Remember when I said it's always Vigenère? Yeah, it's not Vigenère."


Solution

Since "MARTES" is Tuesday in Spanish, you tranlate the answer to Tuesday's Math Challenge puzzle to the Spanish word "melocotonero".  When using a Vigenère Cipher doesn't work, you try other ciphers such as a Subsitution Cipher.  To decipher text encrypted with a Substitution Cipher using a keyword such as "melocotonero":

  1. Remove any duplicate letters from the keyword, resulting in "MELOCTNR".
  2. Remove those letters from the letters of the alphabet, resulting in "ABDFGHIJKPQSUVWXYZ".
  3. Concatenate the two parts from Step 1 and Step 2 to get the 26-letter Substituion Cipher key "MELOCTNRABDFGHIJKPQSUVWXYZ".
  4. Decode each letter of the cipher text by substitution the corresonding letter:
M E L O C T N R A B D F G H I J K P Q S U V W X Y Z
↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Use that table to decode the Challenge cipher text:

O A M O C F I Q G U C P S I Q
↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓
D I A D E L O S M U E R T O S

The answer is stl.la/diadelosmuertos .

RewardEdit

The video of Robyn's Excellent Adventure

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