Old School Ninja Gaiden
A password képernyőn adjuk be az alábbi kódokat:

Ninja Gaiden 1:
Act 1- L,X,A,Y,A,X
Act 2- A,X,X,R,Y,A
Act 3- X,Y,B,R,L,X
Act 4- B,R,A,B,Y,Y
Act 5- X,A,Y,X,L,L
Act 6- R,Y,R,L,A,X

Ninja Gaiden 2:
Act 1- A,A,B,X,Y,R
Act 2- X,L,R,B,B,A
Act 3- L,Y,B,A,R,R
Act 4- A,L,X,Y,Y,B
Act 5- R,A,A,B,X,L
Act 6- Y,L,R,A,Y,R
Act 7- B,B,X,Y,A,L

Ninja Gaiden 3:
Act 1- B,Y,R,L,X,A
Act 2- A,R,R,Y,A,L
Act 3- L,B,R,Y,L,Y
Act 4- R,R,B,A,Y,X
Act 5- Y,A,B,X,R,X
Act 6- B,X,X,A,X,Y
Act 7- X,R,X,Y,Y,L