The second samurai gets a second wind with this complete set of passwords.

Level 2: 1FC1GFBN
Level 3: BSI2VSDQ
Level 4: 2SETGKNO
Level 5: ESEMGIBO
Level 6: DLMACA1F
Level 7: TVJW2ZSE
Level 8: GFD1GFBN
Level 9: 6LSWDRTJ
Level 10: OOK5VVYQ
Level 11: P25KOVWD
Level 12: X1CRTJKO
Level 13: N16W35T4
Level 14: LMNPJJ4V
Level 15: MA4DNMIC