Sudoku Game Solver
As it's name indicates, it helps you to find the solution of any sudoku game, which you can't do it on your own or even if you can but you don't want to or don't have time to do it yourself.
You just need to put the numbers in sudoku solver and click on "Solve" button, that's it. It will do the rest and gives you the solution in the fraction of second.
It is light weight and hence very very fast.