Today, when you order "Number Puzzle", you'll instantly be emailed a Penguin Magic gift certificate. You can spend it on anything you like at Penguin, just like cash. Just complete your order as normal, and within seconds you'll get an email with your gift certificate.
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1. TIES: The Invisi..
Just one piece from the Einstein puzzle range. How will you fare against this brainteaser?
Top of his mathematics class at school, Einstein was solving complex algebraic equations by the age of 12. Numbers were the tools he used to develop his theories and understand the world around him.
Arrange the numbers so that each line horizontally, vertically and corner-to-corner diagonally adds up to 264.
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