If you are old enough you might remember an old arcade game called "Морской Бой" aka "Sea Raider".
You are looking through a periscope of a submarine and you have ten torpedoes to blow up ten ships. If you have no misses you are given three extra rounds of game play.
In this version you can configure several options:
- Use accelerometer or finger to aim
- Select between moving the periscope or everything else