War Against Submarine

One underwater earthquake opened a cave letting out many different and cute submarines which must be .... destroyed. Control a small boat which throws underwater bombs trying to destroy the enemies. If you have wringing of conscience than you should know you are going to meet angry enemies as well. Gain points, they are the most important thing here, because if you want to get into the next level you have to reach certain number. For upgrades you use the same points but be careful and don't spend too much.