Features:
1) LCD display
2) Three modes: time, date and alarm clock
3) Millions of sudoku games and difficult levels for selection
4) Special functions: drafting function, reading function, redoing examination function, double mode operation
5) Rules:
a) Every column, every row and each of the nine 3 x 3 boxes contains digits from 1 through 9
b) Each digit appears only once in every column, every row and each of the nine 3 x 3 boxes
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