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In Invisible, you play as an U-Boot Kommandanz during WWII's war against merchant ships. The game takes place in turns where your goal is to sink the enemy convoys and make it back home safely with a certain amount of sunken vessels on board (or face being chased off by escorts). You have two types of submarines available, Type VIIC or IXC; choose between them before starting each patrol. For successful patrols, you need 20+ tons of sanked ships to be returned for further missions at sea as an U-Boot Kommandanz!