Shinobi, released in the USA (Unl) for the NES, is an action-platformer known for its fast-paced gameplay and challenging level design. The "Unl" likely indicates an unlicensed version, a common occurrence for NES games. The game features a ninja protagonist navigating treacherous levels, utilizing various weapons and ninja skills to defeat enemies.  While its gameplay would be familiar to action platformer fans of the era, specifics about the particular developers of this unlicensed version might be more difficult to trace.

Shinobi (USA) (Unl)

Shin Moero!! Pro Yakyuu (Japan)