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  • NOOK GlowLight Plus 7.8"
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  • NOOK GlowLight Plus 6"

NOOK Tablets

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  • NOOK Tablet 7" & 10.1"
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There are three loops in a tangle of rope. How many are independent, and how many are interlocked?
Two knights stand on a chessboard. How many other knights must you add so that each square is occupied or threatened by a knight?
Among six seemingly identical drawings of mandalas, each rotated by multiples of 60 degrees, one is different. Which is it, and why?
Challenge yourself with these mind-benders, brainteasers, and puzzles. Each of them has been carefully selected so that none will be too...