DUAL! is a two-player game where you have to try to defeat your opponent's ship. The cool thing about this game is being able to play with your friends in person, but to do so, you both need to be connected to the same WiFi network.
In DUAL!, you need to pay attention to both your screen and your opponent's. You have to watch your opponent to see where to aim your shots and also see when shots are heading for you. Shots automatically pass between the screens, and you have to dodge them the best you can in order to win.
To shoot, just tap the screen, or hold it down if you want to send a stronger attack. To move, you just have to tilt your device from side to side and your ship moves accordingly.
DUAL! also lets you work with your opponent and fight together against the AI while avoiding an avalanche of attacks. This cooperative mode adds an extra challenge and is a fun way to spend time with your friends.