Sudoku Unlimited

Why this one?

Sudoku Unlimited comes with many useful features.

It supports Sudoku grids for 9x9 and 16x16 challenges.

You can generate random challenges or define your own ones.

The difficulty of a challenge is measured by the number of cells to be filled in. Five difficulty levels are supported.

Challenges can be stored at any stage of the game.

It supports two input modes. Number Pad: first select a cell then select the number. Single Number: first select the number then wit every tap on a cell that number will be entered in the cell.

The app used to be called "Sudoku Unlimited (FREE, NO PURCHASES, NO ADS)" to improve the user experience and allow the user to determine already from the title that he or she has NOT to pay for the app, can expect NO additional charges once installed and can expect NOT to be flooded with unwanted advertising. Apparently I was wrong. I apologise that now the interested user has to visit several pages to determine what he or she was able to extract with one glance already from the old title.