Saint Seiya 2 (NES)

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8888 Sevensenses, 888 Cosmo/Life

Choose CONTINUE on the title screen & enter these hiragana letters :
"shi" (6x), "ze" (2x), "nu" (2x), "wa" (16x), "a" (5x).

Incase you don't know Japanese letters : (I assume all the counts start from the upper left as 1st column & 1st row)
shi : column 2, row 3
ze : column 9, row 4
nu : column 3, row 5
wa : column 9, row 1
a : column 1, row 1

9999 Sevensenses, 999 Cosmo/Life

Choose CONTINUE on the title screen & enter these hiragana letters :
shi (x6) ga (x2) ze (x2) ga (x16) a (x5)
shi column 2 row 3
ga column 6 row 3
ze column 9 row 4
a column 1 row 1

Ending Password

At the password screen, enter the first Japanese character 14 times. Press Down 6 times, Right 3 times and enter the Japanese character 10 times. Press Left 3 times, Up 6 times and enter the Japanese character 2 times. Press Right 4 times, Down 1 time and enter the Japanese character. Press Up 1 time, Left 4 times and enter the Japanese character 3 times. Press Right 4 times, Down 1 time and enter the Japanese character. Now select End to go to the last area where you'll get the ending.

Last Stage Password

At the password screen, enter the following Japanese characters. Format is Row #, Column #: - 5,6 - 7,4 - 4,2 - 6,10 - 7,3 - - 7,3 - 4,2 - 7,3 - 4,1 - 5,1 - 3,6 - 3,1 - - 1,1 - 1,1 - 1,9 - 1,1 - 1,1 - - 1,1 - 4,9 - 1,1 - 1,1 - 1,1 - 4,9 - 1,1 - - 6,4 - 1,6 - 5,5 - 2,5 - 4,7 - 1,3 - 2,7 -