Super Return of the Jedi
Contributed by-Richard

Debug Menu/Cheat Options

The very first time the Start Game/Option Menu/Password screen
appears, hold L and R on Controller 2, then press A, A, B, B, X, X, Y,
Y, A, B, X, Y, A, B, X, Y on Controller 1. Begin your game normally.
When you want to skip to the end of a stage, hold A and B on
Controller 1 and press Start. If you wish to access the Debug screen,
press L and R on Controller 2. You can then change any options using
Controller 1. 

90+9 Lives

The very first time the "Start Game/Option Menu/Password" screen
appears, press X, X, B, A, Y, Start. Then begin your game normally.

Credits

The very first time the "Start Game/Option Menu/Password" screen
appears, press A, B, A, B, A, B, A, B. If you touch anything after
that, the game will go back to the Title screen. 

Extra Continues

The very first time the "Start Game/Option Menu/Password" screen
appears, press A, B, A, Y, A, X. 

Infinite Thermal Bombs

The very first time the "Start Game/Option Menu/Password" screen
appears, press B, X, B, X, B, X, B, B, B, Y. Any time you want to use
a thermal detonator, press X.

All the passwords:

               Easy:       Brave:      Jedi:
Level 2        RLGQMN      BGFSMH      RRSBTS
Level 3        ZJLMRJ      JVPLHP      YQYHJN
Level 4        LZLKJF      VDLBGG      ZPNKKZ
Level 5        VTYMZX      MKYXVN      BZGBJX
Level 6        QZNFPP      LBRHFR      MSDZZR
Level 7        VKCDFD      GPTDZC      XXVPBG
Level 8        ZCTKFC      DDDQYZ      CQQBKP
Level 9        QYXYHB      TLVHFT      XNHPSF
Level 10       LFWLTQ      NVBJJH      KQMLXP
Level 11       QDQGKH      GRMJYX      MFWHQM
Level 12       CPMRZV      ZKQHQD      VCYNNP
Level 13       CDWLTY      WCBMKS      BPSDVS
Level 14       BPFFZQ      KXVZZD      DSFYGD
Level 15       RMNVLC      BWHPHZ      NJHPHL
Level 16       RVKFKG      MKZYDP      BZCBCB
Level 17       VQXDQJ      KHWKCB      VJKSNJ
Level 18       HLQMVL      WDSMNN      PPNNZY
Level 19       VQJGWF      GWYXGN      CJQKMX
Level 20       ZZSTXZ      BGSWLD      TXQLTM