Sudoku X: Diagonal sudoku game

60,000 games in 6 levels.
You can enjoy it anytime anywhere.
Of course, Sudoku X is free to play !

★Introduction★
Sudoku is famous for fantastic brain game.
Sudoku X adds a new rule of diagonals to popular Sudoku.
You can enjoy this new type of Sudoku more.
Sudoku X is a fun and entertaining apps to help you develop and maintain brain abilities such as memory, concentration and reasoning.
That’s ideal for brain training as well as for killing time.

◆About Function◆
★ Auto save
 └ It’s a function to save a data when you leave a puzzle unfinished. Continue playing anytime.
★ Undo, Redo
 └ It's a function to retrace your steps.
★ Pencil-mark
 └ It’s a function to write down small numbers in the cell.
★ Check Mistake
 └ It’s a function to check your answer.
★ Marker
 └ It’s a function to find a hidden blanks.
★ Technique Hint
 └ It’s a function to give you a hint when you have no idea.