Ninja Gaiden Sigma update 1.03 patch was released today for PS4 and PS5. You can get the complete patch notes here.
This patch has addressed a minor issue with the game that is related to the Technique Scrolls. They should be able to properly display now. To resolve this problem on your version of the game, just download the latest update for it.
Ninja Gaiden Sigma Update 1.03 Patch Notes
Ninja Gaiden Sigma is a part of the Ninja Gaiden Master Collection on PS4. Each of the three NINJA GAIDEN games is still as much fun as you remember, with the same fast-paced action as the originals. Aside from Ryu Hayabusa, four other characters are playable: Ayane, Rachel, Momiji, and Kasumi. You may form a tag team with your favourite characters and easily switch between them during matches.