Developing the Early Learner: Level 1
"The exercises are laid out in a carefully graduated sequence of fun activities.  None of these require strain on you or your child's part.  He or she practices drawing lines from here to there without running his/her lines into the "obstacles," he/she solves mazes, he/she colors the happy face if the birdies look alike and the sad face if they don't.  For the auditory exercises, you might need to ding a spoon on a cup or thunk a book on the table while Junior listens with his eyes shut.      We bought this series for our oldest son when he was four, and he absolutely loved it . . . we could almost visibly see his mind sharpening up as he did the exercises.      The art is engaging, and since the books are all black and white your child can have the added fun of coloring them in.  If your son or daughter is old enough to hold a crayon, he or she is ready to start on the first book of the series.  By the time a child gets to book four, he or she is solving complicated mazes and figuring out the answers to questions like 'House is like tent like glass is to _______?'" --According to Mary Pride's "Big Book of Learning"