The Times Samurai Su Doku 2

For anyone who loves the challenge of Su Doku but manages to solve them within minutes, you can now enjoy the extended mental workout and ultimate endurance test of The Times Samurai Su Doku Book 2.

With its larger and more complex grid, Samurai is Su Doku multiplied. It is a five grid interlinked version and, as with traditional Su Doku puzzles, every column, row and 3x3 box contains the digits 1 to 9. Where the puzzles overlap, the rows and columns do not go beyond their usual 9x9 length ...