Shikaku & Sudoku

Widely regarded as the worlds most prolific wellspring of logic games and brainteasers ... if anyone comes up with the next craze, it will be Nikoli.The New York Times

Here comes shikaku, an exciting new logic puzzle from Nikoli, the Japanese company that sparked the sudoku craze: Picture a square grid made out of rectangles of different sizes, each of which contains a number indicating its area in square units, but not its exact shape or position. Then imagine the lines between the rectangles erased. Can you use the numbers to figure out how to redraw the lines? Its harder than it looks. Shikakus elegantly simple rules offer a surprising challenge that will delight even the most demanding puzzle fans.