Sudoku Brain Master

## Description

Sudoku Brain Master is a logic-based, combinatorial number-placement puzzle. The objective is to fill a 9x9 grid with digits so that each column, each row, and each of the nine 3x3 sub-grids that compose the grid contains all of the digits from 1 to 9.

FEATURES:
\- different difficulties
\- hundreds of puzzles for each difficulty
\- auto pencil mark (draft)
\- hint system