Back to the Future Part III.

 No.  Code  Effect
   1  BDCT-AA8N + BDDT-AA5W    Infinite lives in buckboard chase
   2  AGJA-AADN  2 lives in buckboard chase
   3  A0JA-AADN  6 lives in buckboard chase
   4  BGJA-AADN  10 lives in buckboard chase
   5  CRJA-AADN  20 lives in buckboard chase
   6  A85T-EAGY  Shooting gallery timer runs at 4x normal speed
   7  BL5T-EAGY  Shooting gallery timer runs at 3x normal speed
   8    B85T-EAGY  Shooting gallery timer runs at 2x normal speed
   9  HW5T-EAGY  Shooting gallery timer runs at 1/2x normal speed
 10  ML5T-EAGY  Shooting gallery timer runs at 1/3x normal speed
 11  SC5T-EAGY  Shooting gallery timer runs at 1/4x normal speed
 12  FW5T-ECGY  Shooting gallery timer runs at 1/10x normal speed  
 13  C1AT-EAAY  Small ducks worth 1,550 in shooting gallery
 14  L1AT-ECAY  Small ducks worth 15,550 in shooting gallery
 15  L1AT-FLAY  Small ducks worth 155,550 in shooting gallery
 16  EMBA-ECF6  Flying ducks worth 12,200 in shooting gallery
 17  EMBA-FEF6  Flying ducks worth 122,200 in shooting gallery
 18  A95A-GAF0  4 hits allowed in pie-throwing level
 19  A15A-GAF0  6 hits allowed in pie-throwing level
 20  AS5A-GAF0  8 hits allowed in pie-throwing level
 21   ATGA-JA4A  Infinite hits allowed in pie-throwing level