SUDOKU: CHALLENGING OPTIONS

This comprehensive Sudoku — an Eldorado for lovers of numeric data puzzles. The difficulty of the game has the following options, in the number of cells in the squares:

4x4

6x6

8x8

9x9

12x12

16x16

Among those options are the ones that are perfect for beginners (easy 4x4, 6x6) so that fans will appreciate (8x8, 9x9), and complex, for example: 12x12 or 16x16, may be too tough for even a Pro. However, experts Sudoku, looking at these dimensions, will immediately ask the question. Like squares with a side of more than nine cells at all suitable for Sudoku? Because each digit in a small square must be unique! The question, in this case, the authors elegantly solved with the aid of symbols. If you are familiar with, say, hexadecimal number system, then you'll know what it is about.

In a large (16 by 16) small square consists of 16 cells (4x4), and large composed of 16 small, i.e. the direction into 16 cells. Digital number, in this case will be presented by Robin hexadecimal digits: 1,2,3,4,5,6,7,8,9,A,B,C,D,E,F. 12 cell variant is filled with the reduced set (up to C) presented above the number row.

To ease your task, the game developers put in every cell the possible options the correct solution, thereby reducing the time and number of recruitment, pre-deleting the incorrect lookup.