Home News Ninja Gaiden Sigma 2 Three Ninja Gaiden Sigma 2 videos surface, show loads of fighting News by Stephany Nunneley-Jackson News Editor Published on July 10, 2009 Follow Ninja Gaiden Sigma 2 Eurogamer France has three Ninja Gaiden Sigma 2 gameplay videos posted for your viewing pleasure. Each one stars either Ryu, Ayane or Momji. Game's out in the fall with a demo expected to land on PSN in September. Hit the respective links for each one.