1. You must resolve the problems within a limited time.
2. Degrees of difficulty
Newbie : Very Easy, Easy
Intermediate : Medium
Expert : Hard, Very hard
Sudoku God : Nightmare
3. Auto save the current state when you click the "back" button during the game
4. Sensuous design and interface
5. Sensuous keyboard and notebook
6. Tablet support
7. Total 4000 puzzle
8. All the puzzles Free
