Ninja Gaiden: Sigma Plus is an enhanced remake of the classic action-adventure game Ninja Gaiden, specifically adapted for the PlayStation Vita. Released in 2012, this version includes new features tailored to the Vita's capabilities, such as touch controls and motion sensing. The game retains the fast-paced combat and intricate level design that the series is known for. Players control Ryu Hayabusa, a ninja warrior, as he seeks to retrieve a stolen sword and avenge his clan. The game is known for its difficulty and precise gameplay within the action and hack-and-slash genre.