- UK spy agency releases annual Christmas card puzzle to uncover future codebreakers The Associated Press
- GCHQ intelligence agency reveals Christmas puzzle – containing hidden clues for an extra challenge Sky News
- GHCQ Christmas puzzle hints and answers revealed Yahoo News UK
- Taking on the GCHQ Christmas challenge? These experts can help BBC.com
- GCHQ’s Christmas puzzle contains hidden clues for first time – can you crack the codes? The Telegraph
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