A free program for Android, by Extreme Developers.
In this game you have to build your own battle tank. The more powerful it is, the more targets it will shoot. The more targets you will shoot, the more points you will earn. You will be able to buy a variety of upgrades that will increase the power of your tank. You will be able to fight with other players and win points.
The aim of the game is to defeat all the other players. You will be able to do that by building your own tank, by winning battles, by attacking other players, or by winning the battles against the AI.
If you want to play with friends, you can do that. But you will have to be on the same wi-fi network, or you will be unable to communicate with your friends.