Now you could try sudoku on your phone/tablet, take the challenge and try your brain everywhere, every time.

There are 4 levels:
✓ Easy: for beginning players or warm up time.
✓ Medium: a bit hard, should try it if you have experience on sudoku before.
✓ Hard : It's time for brain training.
✓ Expert : for expert players, preparing for your headache.

And we also bring some useful tools to you, try to use it. It will help to solve puzzle faster.
✓ Undo/Redo: store 20 times, use it to save time.
✓ Track: change you input text and track follow color to know which is correct one.
✓ Duplicated Highlight: All cells have same value as selected one will be highlighted.
✓ Area Highlight: Sub matrix, row and column of selected cell will be highlighted.
✓ Hide Finished Number: If a number is full-filled into board, it will be hidden.