Half Sudoku - diag variant

Half Sudoku is a new variant of Sudoku which incorporates diagonal positioning as well as incomplete rows, columns, and sections which must be considered when placing numbers.

The experience of a Half Sudoku puzzle is quite different from doing an ordinary Sudoku puzzle, though they are based on a similar idea.

**** Half Sudoku features ****

# Content
- 5 difficulty levels

# Features
- "Hint" auto fills the board with memo that has no direct conflicts with other numbers
- Highlight same numbers as you select a number on board