CheatCodes.com has all the official Ninja Gaiden Sigma PS3 cheats to unlock everything. If you know of any that we don't have, please let us know.
All published and official codes as of Sunday May 19, 2013 for Ninja Gaiden Sigma are shown below.
In the underground cemetery before or after you kill the dinosaur. Kill the blue things, run up the steps and back down - they respawn and you can jump down the ladder but its easier to wait for them to come to you. Its better to do before you kill the boss cause it don't work after you go to the hidden underground.
After chapter one. Behind the waterfall there is a large health on the ledge.
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