Invasion of Japan v4.2.2.0

Joni Nuutinen

About this app

Invasion of Japan, also known as Operation Downfall, is a strategy game that solves the problem of providing a historically accurate and engaging WWII experience for players, particularly those interested in alternative history scenarios. This app benefits history buffs and strategy enthusiasts the most, offering a unique perspective on the proposed Allied invasion of Japan. Compared to other games in the Game Strategy category, Invasion of Japan stands out with its focus on historical accuracy and simplicity, but may fall short in terms of graphics and multiplayer features. The app's well-received user rating and lack of in-app purchases are notable advantages.

Pros

The app's high user rating of 4.4/5 indicates a well-designed and enjoyable gaming experience, with players appreciating the historical accuracy and challenging gameplay.
With no in-app purchases or ads, the paid model of $3.99 provides a one-time payment for a complete experience, which is a significant advantage for players who prefer to pay upfront for their games.
The developer, Joni Nuutinen, has a reputation for creating historically accurate and engaging games, which is evident in the attention to detail in Invasion of Japan.
The app's small size and lack of permissions required make it a lightweight and secure option for players, with minimal impact on device performance.
The developer's website and email support provide a clear channel for feedback and updates, indicating a commitment to customer support and community engagement.

Cons

The limited number of downloads, at 500+, may indicate a smaller player base and less community engagement compared to more popular strategy games.
The app's historical focus may not appeal to players looking for more fast-paced or action-oriented strategy games, potentially limiting its appeal to a niche audience.
The lack of multiplayer features may be a drawback for players who enjoy competing with others or participating in online communities.
The app's graphics and sound design may not be as polished as other games in the category, which could be a turn-off for players who prioritize visual and audio quality.

Best for: The ideal user for Invasion of Japan is a history buff or strategy enthusiast aged 18-50, with a strong interest in WWII history and alternative scenarios, who is looking for a challenging and historically accurate gaming experience with a high level of replayability and is willing to pay a one-time fee for a complete and ad-free experience.

Developer Description

Operation Downfall - Proposed Allied WWII Invasion of Japan

Allied WWII Invasion of Japan 1945 is a turn based strategy game set on the Pacific theater as a planned but not carried out operation of the Second World War. From Joni Nuutinen: by a wargamer for the wargamers since 2011. Last update October 2025

This scenario covers Operation Olympic (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.

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

Privacy

Given that the app requires no permissions, players can be confident that their data is not being collected or shared, and the risk of security breaches is minimal. However, as with any paid app, players should be cautious when making purchases and ensure they are buying from a trusted source. To further protect their devices, players should keep their operating system and apps up to date.

Tips

To get the most out of Invasion of Japan, players should start by familiarizing themselves with the game's historical context and mechanics, which can be found on the developer's website. Additionally, players can optimize performance by closing other resource-intensive apps and ensuring their device is fully charged. For a more immersive experience, players can also explore other games in the Conflict Series, which offer similar historical strategy gameplay.

What's New

+ Patches: Naval element off, Engineer dugout creation, extra MPs in rear area water

Version Information

Version: 4.2.2.0
Downloads: 500+
Updated on: Oct 25, 2025
Released: Jan 27, 2017
Requires: Android 5.0

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Invasion of Japan users say on Google Play

★★★★★

A Google user

This is a regiment-level stimulation of Operation Olympic, the battle that never happened, and it's got all the features you love in this series and more, such as engineer units and aircraft carriers. Logistics plays a part as always, with supplies for the ground troops and fuel for the naval units needing to be brought in. I definitely like having the engineers clear terrain and build roads; it makes shuttling units between the front line and hospital so much quicker.

★★★

A Google user

It's OK. Still a few bugs to eliminate, but Joni does a great job of continuously improving his games. The battle is never really in doubt. You'll take the island eventually so it is essentially a race against time campaign. I played with the naval option on, but probably won't in the future as I don't feel like it really added anything to the overall gameplay.