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2. Verbal arithmetic - Wikipedia

   en.wikipedia.org/wiki/Verbal_arithmetic

   Verbal arithmetic, also known as alphametics, cryptarithmetic, cryptarithm or word addition, is a type of mathematical game consisting of a mathematical equation among unknown numbers, whose digits are represented by letters of the alphabet. The goal is to identify the value of each letter.

3. Cryptogram - Wikipedia

   en.wikipedia.org/wiki/Cryptogram

   Occasionally, cryptogram puzzle makers will start the solver off with a few letters. A printed code key form (the alphabet with a blank under each letter to fill in the substituted letter) is usually not provided but can be drawn to use as a solving aid if needed. Skilled puzzle solvers should require neither a code key form nor starter clue ...

4. List of letters used in mathematics, science, and engineering

   en.wikipedia.org/wiki/List_of_letters_used_in...

   Latin and Greek letters are used in mathematics, science, engineering, and other areas where mathematical notation is used as symbols for constants, special functions, and also conventionally for variables representing certain quantities.

5. Play Letter Garden Online for Free - AOL.com

   www.aol.com/games/play/masque-publishing/letter...

   Enjoy a word-linking puzzle game where you clear space for flowers to grow by spelling words.

6. Bacon's cipher - Wikipedia

   en.wikipedia.org/wiki/Bacon's_cipher

   Then each letter of the false message must be presented in the appropriate typeface, according to whether it stands for an A or a B. [4] To decode the message, the reverse method is applied. Each "typeface 1" letter in the false message is replaced with an A and each "typeface 2" letter is replaced with a B. The Baconian alphabet is then used ...

7. Playfair cipher - Wikipedia

   en.wikipedia.org/wiki/Playfair_cipher

   The German Army, Air Force and Police used the Double Playfair cipher as a medium-grade cipher in WWII, based on the British Playfair cipher they had broken early in WWI. [16] They adapted it by introducing a second square from which the second letter of each bigram was selected, and dispensed with the keyword, placing the letters in random order.