P.T.O. IV (Pacific Theater of Operations IV), released as Teitoku no Ketsudan IV (提督の決断IV?) in Japan, is a World War II-themed strategy for the PlayStation 2 and PC produced by Koei. It focuses on naval combat in the maritime theaters of World War II, encompassing the Pacific Ocean, Mediterranean Sea, Atlantic Ocean, and Indian Ocean, with the option of playing as one of four major maritime powers of the time: Germany, Japan, the United Kingdom, or the United States. P.T.O. IV is the latest game in Koei's P.T.O. series.
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