Sudoku16(Solver)

It's a Sudoku solver for 16*16 puzzles

This is an inhanced version for Sudoku(Solver) which can be used to sovle 16*16 puzzles.
Ideas of the program is the same as Sudoku(Solver).
the problem is solved through 2 steps
step1: with SudokuMethod1
in each square, list all the possible numbers
if there is only 1 possible numbers, this is the one
if in each row, column or block, one possible number occurs
only once, this is the one
step2: if there is only 2 possible number in one square
try each one to see which one is the correct one