Go! Benny! (Unl) is an NES game, the "(Unl)" likely indicates an unlicensed release. This means it wasn't officially produced or distributed by Nintendo or a licensed publisher, hence the lack of readily available information. The gameplay is currently unknown. It may have been a homebrew game or a pirate copy.  The developers remain unknown. Further research is needed to determine its origin.

Go! Benny! (Unl)

Ginga Eiyuu Densetsu (Japan)