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Left difficulty switch must be set to B position for "Ensign" mode. In this setting, "Hi-Tech" submarines face "Standard" destroyers.
Right difficulty switch must be set to B position. On this setting, new enemy ship types are introduced slowly.
BB is the easiest difficulty setting.
Old rules edited 19 Feb 2019
Track title edited 19 Feb 2019
EMU - Game 1, Difficulty BB -