It's so addictive it should have its own rehab program. It's Sudoku, the puzzle that's gripped a nation. Virtually every national newspaper features a daily dose of Sudoku, and the pocket puzzle books are flying off the shelves. But if you that's not enough to satisfy your habit, the Sudoku Master Puzzle is for you. This easy to use electronic gizmo has an incredible 1 million puzzles built in.