Square Pear Three “Hey Diddle Riddle” is the latest Square Pears volume authored and illustrated by Kenn Vidro. It was published in September of 2005 by Gilbert Square Books. This edition is full of 75 riddles , as the second book was, to challenge even the pro puzzle solver. As in the first two Square Pears books, the brain teasers get harder the deeper you get into it which makes it fun as well as challenging. This is a definite “must-have” for the Square Pear fan as well as the word-game lover. As the first two books, it is an excellent book to challenge every readers’ critical thinking abilities. It is also a valuable book to greatly increase one’s vocabulary as well as aid them in practicing phonemic awareness.