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  2. Mastermind (board game) - Wikipedia

    en.wikipedia.org/wiki/Mastermind_(board_game)

    Both players simultaneously play code maker and code breaker. Parker Mastermind: 1993 8 4 Mastermind for Kids: 1996 6 3 Animal theme Mastermind Secret Search: 1997 26 letters 3-6 Valid words only; clues are provided letter-by-letter using up/down arrows for earlier/later in the alphabet. Electronic Hand-Held Mastermind (Hasbro) 1997 6 4

  3. Race to Escape - Wikipedia

    en.wikipedia.org/wiki/Race_to_Escape

    Once the game starts, each team has an hour to try to figure out five four-digit codes in a sequence of puzzles to escape the room, and to beat the other team to do so. Each team starts with the chance to win $25,000, but after 20 minutes, each minute they remain in the room costs them $500.

  4. IFF Mark X - Wikipedia

    en.wikipedia.org/wiki/IFF_Mark_X

    This is sometimes known as the "mission signal" and set by the air controllers prior to flight. In Mode 2 and 3, all 4096 possible 4-digit codes from 0000 to 7777 are allowed. [21] For Mode 3/A, the value of each of the digits, 0 to 7, is set through front-panel switches. For civilian use this is a code provided by the ATC controllers.

  5. What’s a Personal Identification Number (PIN) - AOL

    www.aol.com/finance/personal-identification...

    An individual’s PIN is the four-digit code they set after opening a debit account with their bank of choice. It is used as a layer of authentication when they perform an electronic transaction ...

  6. Code Breaker - Wikipedia

    en.wikipedia.org/wiki/Code_Breaker

    Code Breaker was a cheat device developed by Pelican Accessories, which were available for PlayStation, PlayStation 2, Dreamcast, Game Boy Color, Game Boy Advance, and Nintendo DS. Along with competing product Action Replay , it is one of the few currently supported video game cheat devices.

  7. Four-square cipher - Wikipedia

    en.wikipedia.org/wiki/Four-square_cipher

    The four-square cipher is a manual symmetric encryption technique. [1] It was invented by the French cryptographer Felix Delastelle . The technique encrypts pairs of letters ( digraphs ), and falls into a category of ciphers known as polygraphic substitution ciphers .

  8. BATCO - Wikipedia

    en.wikipedia.org/wiki/BATCO

    Some vocabulary card entries call for a fixed number of digits after the two digit code. For example, the code for ETA (estimated time of arrival) is followed by a four digit time of day. Each card in a set has a three digit number and there is always a code word on the card that means switch to card number xxx. [2]

  9. Straddling checkerboard - Wikipedia

    en.wikipedia.org/wiki/Straddling_checkerboard

    This means a digit is encrypted by 3 ciphertext characters; 2 for the escape character, 1 for the digit itself. In this scheme, each digit requires an escape character encoded before it. Double-Digit Scheme : If the escape character is encoded by two different digits (e.g. '26' in the example above), then multiple digits can be encoded by ...