This article contains everything you need to know about how scoring works on Sudoku. 

 

Difficulty Bonus:

 

Easy: 100 points 

Medium: 200 points 

Hard: 300 points 

Expert: 400 points  

 

Time Bonus:


Easy: 180 sec minus Time spent 

Medium: 360 sec minus Time spent 

Hard: 540 sec minus Time spent 

Expert: 720 sec minus Time spent 

If more time is spent than alloted for the difficulty level, the Time Bonus will be Zero. 
 

Final Score = Percentage [Completing puzzle without help or errors]  * (Difficulty Bonus +  Time Bonus)