K.O. Sudoku Pro

K.O. Sudoku Pro version.
1. Permanent ad-free;
2. Unlimited prompts;
3. Open all types sudoku game store;
4. Cloud backup;
5. Early access to new features;
Take photo, to get sudoku answers / step-by-step explanations immediately.
It supports 4/6/8/9/12/16 grid sudoku, jigsaw sudoku, killer sudoku, kendoku, balanced sudoku, odd/even sudoku, compdoku, 3D sudoku, samurai sudoku, flower sudoku, windmill sudoku, gattai sudoku, butterfly sudoku, cross sudoku, twodoku, triple doku, sohei sudoku, diagonal sudoku, percent sudoku, window sudoku, asterisk sudoku, girandola sudoku, center dot sudoku, offset sudoku, etc.
There are also technique tutorials and a rich online sudoku store.