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Maru's Mission

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Title Screen

Maru's Mission

Also known as: Oira Jajamaru! Sekai Daibouken (JP), Ninja Jajamaru: The Great World Adventure (rerelease)
Developer: TOSE
Publisher: Jaleco
Platforms: Game Boy, Unlicensed Game Boy Color
Released in JP: September 28, 1990
Released in US: March 1991

RegionIcon.png This game has regional differences.

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This page is rather stubbly and could use some expansion.
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The first game in the Jajamaru series to get a western release.

A re-translation, as well as a colorized Game Boy Color version, were released as part of Ninja Jajamaru: Retro Collection in 2023.

To do:
More regional differences. Source
  • Compare the new translation, and the GBC port.

Regional Differences

Title Screen

Japan US
Oira Jajamaru Sekaidai Boken j title.png Maru's Mission gb title.png


Japan US
Oira Jajamaru Sekaidai Boken j intro-1.png

Oira Jajamaru Sekaidai Boken j intro-2.png

Maru's Mission intro-1.png

Maru's Mission intro-2.png


  • The Romania stage has large crosses that were removed in the US version.
  • Exclusive to the US version are two sub-boss fights against a doppelganger of Maru. He is encountered in the second half of the USA stage and in the second half of the Japan stage.
  • Many sprites and portraits are different between the Japanese and US versions.

Revisional Differences

To do:
There may be a Japanese GBC version.
  • The re-translation also has a monochrome version.
  • Check for any other changes.

The Great World Adventure DX

The DX version is Game Boy Color exclusive, enhancing the game to full color.

Ninja Jajamaru - The Great World Adventure DX title.png

As expected, it has an additional screen when played on an original or Super Game Boy. This remains unused in the Switch and PS4 releases, but it's possible with the cartridge copy.

Ninja Jajamaru - The Great World Adventure DX error.png