Game Otsomatsu-kun Hachamecha Gekiio
Author/Vendor Sega
Released 1990
Game Type Platform
Language Japanese
Gens (1.00)
You play a goofy-looking boy with a slingshot running around on a tropical island tangling with the locals and the usual platform pratfalls. Appears to have been inspired by a children's manga or anime series.

A rather lame and hackneyed Super Mario Brothers clone obviously intended for a juvenile audience. If you don't have it, then you're not missing anything.