Sudoku Ads free (If you win)

This Sudoku game is for beginners like myself or advance players like yourself :) What is so special about this Sudoku is that, the Ads will be removed as a reward once you score 100% on each stage. For example, if you play "Super easy" Sudoku and once you get 100%, the Ads will be removed forever for that particular level which means you can play Sudoku as many times as you want and no Ads will be displayed. In total, there are 4 different levels and unlimited number of well-formed puzzles. Technically, this is going to be an Ads free sudoku app once you score 100%. You can apply color the empty box and also you can add notes.