Sudoku Plus

Sudoku is a logic puzzle game, combinatorial number-placement puzzle.
You have 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:
- multi-level
- many difficulty
- auto-save your puzzle
- unlimited undo/redo/eraser
- unlimited note
- highlight selected cell
- highlight selected line
- highlight errors
- support phones and tablets