Ninja Gaiden Sigma 2 is an action-adventure hack and slash game, an enhanced version of Ninja Gaiden II with updated visuals, higher resolution, and reworked content. Players control the ninja Ryu Hayabusa through combat that combines melee and ranged weapons against large numbers of enemies and oversized bosses. The version adds an online cooperative mode and three additional playable characters. It was later included in the Ninja Gaiden: Master Collection, and an Unreal Engine 5 remaster titled Ninja Gaiden 2 Black followed in 2025.