忍者龍剣伝
Ninja Gaiden Sigma 2, stylized as Ninja Gaiden Σ2, is a port of the 2008 Xbox 360 video game "Ninja Gaiden II", and was developed by Team Ninja exclusively for the PlayStation 3 in 2009. It includes the entirety of the original story mode as well as various changes to the game's design, along with updated textures and a 720p resolution. The game changes "Ninja Gaiden II" in a similar, but not identical way to how "Ninja Gaiden Sigma" changed the original "Ninja Gaiden". A port for the PlayStation Vita, titled Ninja Gaiden Sigma 2 Plus (Ninja Gaiden Σ2+), was released in 2013.