Select the Easy difficulty setting and play mission 1. Save all POWs on your way to the split in the path, which is indicated after they say ""Thank you". You should have rescued three POWs (including the girl) by the time the path splits. When reaching the split where the submarine is below and the crab people are below, follow the uppe rpath to save two more POWs. When the path splits again, with a ship below and an upper path, select the lower path to the ship. Save seven POWs there (one on the ship, and six dangling above you). When you reach the SV, shoot him until he stops tossing fireballs and instead fires large black rockets from his second cannon. When this happens, stop shooting and hug the right side. A POW will occasionally appear that you can save. A maximum of ten POWs will appear at this location. After no more POWs appear, continue and complete the level. You can usually get a total of 21 or 22 POWs saved per run. Repeat the process to build the overall number of POWs saved.