Think submarines are fun? Wait until you try this app! This game is an addictive and fun harbor simulation game that you will not want to put down! Submarine Rules and Regulations: 1. NO COLLISIONS! submarines cannot 'bump' into each other. Keep your distance, accidents can happen even without a bump! watch out! 2.There are 3/4 colored ports (red, blue and yellow), you need to park boats according to their color. 3. If you try to park a sub in the wrong deck/port you will crash!