Gary Grigsby's Pacific War is a 1992 strategy wargame released by Strategic Simulations, Inc.. It covers World War II in the Pacific between the Imperial forces of the Japanese Empire and the Allies, which include the USA, the British Empire, the Netherlands, Australia, New Zealand, Canada, the Philippines, and China. The main map of the game stretches from north of the Aleutians to southern New Zealand and Australia, and from the eastern coast of India to the West Coast of North America. It includes aircraft carrier operations, amphibious assaults, surface bombardments/engagements, strategic bombing, kamikazes, and the submarine war against naval and merchant shipping.
The most recent version, 3.2 or the "Matrix Version", is currently available as a freeware download from Matrix Games.
Source: Wikipedia, "Gary Grigsby's Pacific War," available under the CC-BY-SA License.