Maru's Mission

Maru's Mission is an action video game released in 1991 by Jaleco for the original Game Boy. It was released in Japan as "I'm Jajamaru! World Adventure" (おいらじゃじゃ丸！～世界大冒険～) on September 28, 1990. The game was released to the Japanese 3DS Virtual Console in January 2012 and later in North America in February.

It is the first game from the Jajamaru series, aside from the loosely related Ninja Taro, to be released in North America, until the release of Ninja JaJaMaru-kun through the Virtual Console. The soundtrack, as well as many sprites and some cut-scenes of the North American version are different from the original Japanese.

Gameplay
Maru's girlfriend Cori is kidnapped and hidden in a secret location. The player is Maru, and moves through six levels based on various folklore monsters.

Worlds

 * 1) North America: A forest
 * 2) * Mini boss: Eyeclops
 * 3) * Boss battle: Insector
 * 4) Romania: First level is a desert. Second is a cemetery.
 * 5) * Mini boss: Wolfman
 * 6) * Boss battle: Dracula
 * 7) Greece: An underground bone cavern
 * 8) * Mini boss: Golem
 * 9) * Boss battle: Medusa
 * 10) Egypt: A desert
 * 11) * Mini boss: Sphinx
 * 12) * Boss battle: Isis
 * 13) Brazil: First level is a mountain. Second is a cemetery.
 * 14) * Mini boss: Hydra
 * 15) * Boss battle: Kelbelos
 * 16) Japan: A Ninja dojo
 * 17) * Mini boss: Nioh
 * 18) * Boss battle: Muramasa

Ninja JajaMaru: The Great World Adventure
In 2023 this game was re-released for the Game Boy Color in English with the name Ninja JajaMaru: The Great World Adventure.