Ninja Gaiden Sigma 2 Plus, also known as Ninja Gaiden Σ2 Plus, is an updated port of Ninja Gaiden Sigma 2 for the PlayStation Vita. It was released in Japan on February 28, 2013. Like the previous Vita port, Ninja Gaiden Sigma Plus, Ninja Gaiden Sigma 2 Plus features the Hero difficulty setting, which allows Ryu to automatically block, dodge, and have access to infinite ninpo when he is low on health.