Sudoku GDXF

Sudoku GDX is a simple app with 4 difficulty levels and everything you need to play sudoku. With annotations "#/1" puts by the user or "hints" that are automatic annotations to ease your game if you are having troubles. Sudoku "checker" that will tell you if you are in the correct path. "Undo" last move that goes until you hit the barebones sudoku. The game will be saved when you left the app so you can return to finish the puzzle another time.