Sub-Attack

Move your ship around dropping depth charges to try and take out the subs below you. Dodge torpedoes whenever possible, as each torpedo takes away one life. For every 20 subs you kill, you gain a level. Every second level gets you another life. Each sub increases your score by one, and every sub you let get to the opposite end of the screen decreases your score by 2. It gets progressively harder as the levels increase.