Gavin Qin

  • Sudoku




    Sudoku is a logic-based,combinatorial number-placement puzzle. The objective is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 sub-grids that compose the grid (also called "boxes", "blocks", "regions", or...

  • Bluetooth Barcode




    connect to bluetooth barcode device and then read data. now the phone can only as a client.

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