Sell Handheld Sudoku Game With 8 Levels

Features: 1) Contains more than 1,000,000 Sudoku puzzles 2) Players can set one group of puzzles by themselves 3) Rules: every column, every row and each of the nine 3 x 3 boxes contains digits from 1 through 9 4) Each digit appears only once in every column, every row and each of the nine 3 x 3 boxes 5) Has the functions of draft, grade, retest and double-mode operation 6) LCD size: 50 x 57mm