The under sea cannon can be moved linearly or positioned to steer, completely set according to the preferences. There are also settings such as tracking and auto fire.

The game is divided into classic mode and defense mode.

The classic mode needs to shoot enemies as much as possible within a limited time to gain high scores and complete levels.

The defense mode is similar to the tower defense game. If the enemy is destroyed by a certain amount, the level can be completed. If the cannon collides with an enemy, it will cause damage to the cannon.

After a certain number of shots, special enemy of different colors will appear. Destroying special enemy can enhance the power of the cannon or get other benefit that help to complete levels.