Unfortunately, you cannot earn money directly from solving sudoku puzzles. However, you can use your skills to make money indirectly. For example, you can create your own sudoku puzzles or offer sudoku-solving services to people who need help. You can also join sudoku competitions and win prizes.
Andoku Sudoku 3 is the best offline sudoku app for Android users. It has 10,000 puzzles with six variations of sudoku and eight levels of difficulty. There are also autosave features, automatic error checking, and pencil mark compatibility.