SuMine - The Hidden Sudoku

Starting with a hidden 9x9 Sudoku grid, the
objective is to fill the grid so that each
you maximise the sum of numbers that you find in each turn.
You play alternatively i.e. you play and then the bot plays.

In Single player mode, You need to maximise the ratio of sum of numbers in each move by total move. The goal is to maximise it in 20 moves.
The higher numbers you find the better your ratio would be!!!!