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GCHQ releases annual Christmas puzzle - can you solve it?

GCHQ releases annual Christmas puzzle - can you solve it?

Update: 2025-12-10
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GCHQ has released its annual Christmas challenge, with seven puzzles aimed to put the nation's codebreaking skills to the test.
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GCHQ releases annual Christmas puzzle - can you solve it?

GCHQ releases annual Christmas puzzle - can you solve it?