This game was made by Tecmo expecting to get a T rating , and it failed. The game really doesn't deserve a M rating , Sigma was meant to be a Ninja Gaiden Series for Teens but both games failed. Ninja Gaiden 2 for the Xbox 360 did deserve an M rating because it was insanely Violent but Sigma it not bad at all. The Violence in Ninja Gaiden Sigma is only moderate with a Prince of Persia level of Violence. I do not remember seeing Any / Much Blood in Gameplay. Overall this is a great game worth buying and can now be for $25 on Amazon. The combat in this game is absolutely epic and my favourite Hack and Slash game of All Time.