Invasion of Japan

Allied Invasion of Japan 1945 is a turn based strategy game set on the Pacific theater modelling the planned but not carried out WWII operation. From Joni Nuutinen: by a wargamer for the wargamers since 2011. Latest patches out on September 2026.

This scenario covers Operation Olympic (Allied landing on Kyushu), which was the first part of Operation Downfall (the invasion of Japan). The second part, Operation Coronet, was supposed to take place in 1946.

By default, the campaign includes Allied naval fleets (battleships, aircraft carriers, dive bombers, tankers) to fight Japanese submarines and kamikazes. The entire naval element can be turned OFF from the settings. The allied plan called for landing on three separate zones, and the supply flow is partly calculated based on this, but nothing prevents the player from gaining control of the seas and carrying out a landing elsewhere on the island to speed up the conquest.

In this campaign, you are in command of the US amphibious force tasked with seizing Kyushu, the southernmost of the Japanese home islands, to set the stage for the second stage of Operation Downfall.

The geography of Japan has forced the Allies to choose a predictable strategy, and the Japanese have set up their forces well to take on the American onslaught. To defend Kyushu, Japan is planning to throw in most of its troops, as well as a huge number of local fighting units and what's left of its naval might. The fact that Japan is starting to run low on supplies is counterbalanced by the incredible supply distances that allies have to deal with, not forgetting kamikaze planes and midget submarines.

FEATURES:

+ Thanks to a huge amount of in-built variation and the game's unique AI, each game provides a different war gaming experience.

+ Settings: A ton of options are available to alter the feel of the gaming experience: Change difficulty level, hexagon size, Animation speed, choose icon set for units (NATO or REAL) and cities (Round, Shield, Square, block of houses), decide what is drawn on the map, weather and storms, and much much more.


"The Japanese soldier was a fine fighting man. He was well-trained, well-equipped, and very good at fighting in jungles and mountains. He was also disciplined and fanatical, and he would fight to the end. The Japanese army was also very well organized and led. It had a clear understanding of its objectives and it was always prepared to adapt its tactics to meet the changing situation."
-- General William Slim in his book Defeat into Victory

Recent changes:
+ Fix: Landing MP cost not activating