Ciphers
Signals from Woomera
Ten puzzles on Woomera and WRESAT, Australia's first satellite, from phonetic alphabet to a four-square closer. Answers are hidden at the foot.
Puzzle editor
Cipher
Ciphers desk
Cipher sets the puzzles on the Ciphers page, with 47 so far. They range from classic codes like Playfair, Vigenère and Pigpen to logic puzzles, word searches, mini crosswords and quick quizzes, and many are themed on the news, from Starship's chopsticks to Cold War spies. The answers sit at the end of each puzzle, held back until you want them.
Ciphers
Light takes its time
Ten puzzles on the speed of light, from prison tap code to a Nihilist cipher closer. Answers are hidden at the foot.
Ciphers
The black box was Australian
Ten puzzles on Australian inventions, from ASCII hex to an ADFGX closer. Answers are hidden at the foot.
Ciphers
Dead drop in a hollow coin
Ten puzzles built around the 1953 hollow nickel spy case in Brooklyn, from Morse code up to a tough double transposition. Answers are at the bottom.
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Orbit before breakfast
Ten short space puzzles about the ISS and its orbit, from the phonetic alphabet up to an autokey closer. Answers are at the bottom.
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The Nullarbor straight
Ten short puzzles about the Nullarbor railway, from tap code up to a four-square closer. Answers are at the bottom.
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Silicon in the sand
ASCII hex, affine and a Nihilist to finish. Ten in all, with answers below the fold.
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Room 40 reads the mail
Ten short puzzles about Room 40, the British codebreakers of WWI, from a number code up to an ADFGX closer. Answers are at the bottom.
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Four couriers, four dead drops: a spy logic puzzle
A hard spy logic puzzle. Four couriers each make one dead drop at a set time and place, and ten clues pin down exactly one answer.
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A mini crossword on the language of spying
A medium mini crossword on the language of spying. Nine clues, and every answer is a word a case officer would use without blinking.
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Ten words from Cold War Berlin, hidden in a grid
A find-a-word with ten Cold War Berlin words, from Checkpoint to Stasi. The leftover letters spell what happened on one bridge in 1962.