is su doku multiplied. It is a five grid interlinked version and, as with traditional su doku puzzles, every column, row, and three by three box contains the digits 1 to 9. Where the puzzles overlap, the rows and columns do not go beyond their usual nine by nine length but the interlocking boxes provide more clues—and more complexity. With 100 samurai su duko at four levels—30 Mild, 30 Difficult, 30 Super Difficult, and 10 Deadly—even the speediest of solvers will be agonizing over this collection of ultra-complex, extended brain-teasers.

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