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Teitoku no Ketsudan III is a turn-based war strategy game centered on World War 2 naval battles, and the third game in Koei's Pacific Theater of Operations series. In the main scenario, the player chooses either the US or Japanese navy and commands the forces in the Pacific Theater starting in 1941. There are also several other shorter scenarios based on specific battles.

Compared to the previous title, many elements have been changed or upgraded; air and submarine combat options have been expanded, as have the systems for diplomatic relations and military support from allied nations, and the player also now has limited control over their country's army as it relates to naval strategy and deployment. The PC98 release also includes support for networked multiplayer, while the console releases are limited to the single-player campaign.