A free app for Android, by Empirics Games.

Classic Sudoku Puzzle Guru is a logic puzzle game that will help you train your brain. The game consists of a grid of numbers that you need to place in a 9 × 9 grid so that each column, each row, and each of the nine 3 × 3 subgrids that compose the grid contain all of the numbers from 1 to 9.

This logic puzzle game is easy to play for beginners, yet difficult for advanced players. The difficulty level is adjusted to your skill level so that you can play at your own pace. The game has an intuitive interface and a very easy control.

CLASSIC SUDOKU PUZZLE GURU has three different game modes: Easy, Medium, and Hard. The first one is the most basic, with the easiest puzzles and the easiest difficulty level. The third one is the hardest, with the hardest puzzles and the hardest difficulty level.

You can get cool prizes and achievements for playing the game, and you can compete with your friends.