These 64 puzzlers are designed for the deep-thinking "child" (age 8-99), who isn't satisfied with endless lists of long-division problems. The questions are simple to understand, yet require a child to think critically. All problems are based on the idea of grabbing socks from a drawer. The difficulty level is progressive, beginning with two colors of socks, and escalating to unknown numbers of colors, and unknown numbers of sock for each color. We believe in the weightlifting principle: start light, and increase the poundage.