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"Code Enigma Riddle"
Bletchley Park Brainteasers: The World War II Codebreakers Who Beat the Enigma Machine--And More Than 100 Puzzles and Riddles That Inspired Them
Sinclair McKay
ALPHAMETICS PUZZLE BOOK– NUMBERS BEHIND LETTERS : CRACK THE ANIMAL ENIGMA CODE . 101 Fun and Challenging Cryptarithms Word & Math Riddles with Solutions .
MME MAHMOHA Editor
Large Print Cryptograms: 175 Riddles and Enigmas: Each Code Hides a Riddle—Can You Crack Them Both?
Pencil & Page
NUMBERS BEHIND LETTERS - A FUN AND CHALLENGING ALPHAMETIC PUZZLE BOOK : COUNTRIES ENIGMA CODE , EASY INTERMEDIATE HARD CRYPTARITHM PUZZLES WITH ... AIDS , LOGIC GAME , WORD MATH RIDDLES .
MME MAHMOHA Editor
Untying the Knot: on Riddles and Other Enigmatic Codes
Galit and David Shulman Hasan-Rokem