CDC? is a children's puzzle book written and illustrated by author and cartoonist William Steig. Originally published in 1984, it is a sequel to CDB!, and is of the same concept: letters and numbers which suggest the sounds of words or phrases are printed as captions for interpretive cartoons. The reader guesses what the letters and numbers are supposed to represent in actual words. The book is somewhat more sophisticated in content than CDB!, using more complicated phrases. The book, in its 1984 release, was originally printed in black-and-white, and was republished and re-released with pen-and-ink watercolor style pictures and an answer-key at the end. To figure out the word puzzles, the reader needs to read the letters, numbers, and symbols aloud, pronouncing their names, not sounding them out. The picture accompanying each puzzle helps give the reader hints to the coded phrase.
The books title, CDC?, translates: as "See (CEE, pronunciation of the letter c's name) the (DEE, pronunciation of the letter d's name, which sounds close to DUH, casual pronunciation of "the") Sea (CEE)?"