PSi - I have a love/hate relationship with this series: Ninja Gaiden and its subsequent updates are some of my favorite action games of all time. Ninja Gaiden II fumbled the ball in a few key areas, but it was more visceral and impactful than ever before; Sigma 2 fixed some of its problems, but bowdlerized the violence to the point where it was more deserving of a T rating. And Ninja Gaiden 3... well, my hatred of that game is documented, and I hope to get the chance to see if Razor's Edge salvages any of its potential. In the meantime, I've spent some time with Ninja Gaiden Sigma 2 Plus. If a game goes from Ninja Gaiden II to Ninja Gaiden Sigma 2 to Ninja Gaiden Sigma 2 Plus, I have no choice but to expect the one with the most qualifying words to be the best of the three. Such is not the case. It's the same fun game, but it suffers from a lack of meaningful upgrades and possibly the worst performance issues I've seen in a Vita game.