The “Ninja Gaiden” series is respected and beloved across the entire gaming world, and has sold 6.8 million units in total. In this collection, the three titles from the series which are included are: NINJA GAIDEN Sigma (released in 2007), NINJA GAIDEN Sigma 2 (released in 2009), and NINJA GAIDEN 3: Razor’s Edge (released in 2012). Become the ultimate ninja and defeat deadly enemies! 累計銷售超過680萬套的人氣系列「NINJA GAIDEN」中，至今仍作為高難度動作遊戲而為人稱道的三部不朽名作『NINJA GAIDEN Sigma』，『NINJA GAIDEN Sigma 2』與『NINJA GAIDEN 3: Razor's Edge』將以合集登場。 化身為最強的無敵超忍，擊敗阻礙你的宿命強敵吧！ 語言版本：忍者外傳 Σ：日文 / 英文 　　　　　忍者外傳 Σ2、忍者外傳 3：利刃邊緣：繁體中文 / 日文 / 英文 * Online multiplayer is not available for the “TAG MISSIONS” in NINJA GAIDEN Sigma 2. * The "Clan Battle" for "Shadows of the World" in NINJA GAIDEN 3 Razor's Edge is not included. Online multiplayer is not available for “Ninja Trials”. *4K resolution/60 fps will be supported in the PS4 Pro/PS5/Xbox One X/Xbox Series X|S versions, and in the Steam version when the PC specifications are met, although there may be fluctuations during gameplay.