Little Ninja Brothers [Model NES-C2-USA]

Little Ninja Brothers © 1990 Culture Brain

North American release. Game developed in Japan. See the original Famicom version for more information: Super Chinese 2 - Dragon Kid [Model CBF-C2].

Description from the back cover:

Start out on a journey. You are spirited Ninja boys, Jack and Ryu. Now, go out on your journey to save the once merry world, Chinaland!