Ninja Gaiden Sigma 2 takes the series further with the introduction of an all-new Team Missions online co-op mode and Chapter Challenge mode, multiple playable characters, large weapon variety, "Ninja Record" player stat system and more. Encapsulating these features into one package makes Ninja Gaiden Sigma 2 not only the most challenging and addictive action game, but also the most definitive version of the series to date.