Domino Solitaire 12 is a free, easy-to-play game available on Android. The objective of the game is to remove dominoes in pairs so that the sum of the dots on each pair equals 12. This game is not only fun, but it can also help children learn basic arithmetic while providing a quick and enjoyable break for adults.

The game is simple and straightforward to play. You need to match pairs of dominoes with a total of 12 dots, and once you've matched them, they disappear from the board. The game ends when there are no more pairs left to match. With its easy-to-use interface and uncomplicated gameplay, Domino Solitaire 12 is a great way to spend a few minutes of your free time.