The game is a classic logic puzzle game. There are several variations, but this version is the most popular and best known. It has been played for many years, and it is considered one of the best brain games for Android. It is also recommended by psychologists and teachers. The game is designed to challenge your brain and mind, and it can be played by anyone, even kids, with or without education. It is also a perfect game to play with friends and family.

The rules are very simple. Each cell or box must be filled with a number from 1 to 9. The number in each cell must be unique. The number in each row, column, and block must be unique as well.

The goal is to find and eliminate all duplicates. The duplicates must be identical.