The following are known GameShark Codes for Um Jammer Lammy on Sony Playstation (PS1).

• P1 Always ‘Rockin’ Modifier
  80072790 00??
• P2 Always ‘Rockin’ Modifier
  8007279A 00??

Modifers

• 00: Cool
• 04: Good
• 08: Bad
• 0C: Awful
• P1 Max Score (1 Player Mode)
  80078D12 270F
• Enable All Stages
  301A58F9 0001
  801A58FA 3F3F
  801A58FC 3F3F
  801A58FE 3F3F
• Have All Crowns
  301A58E9 000B
  801A58EA 3F3F
  801A58EC 3F3F
  801A58EE 3F3F
• All Effect Possession (Press Select)
  301A58E7 003F
• P1 Max Score (2 Player Mode)
  801A3514 270F
• P2 Max Score (2 Player Mode)
  801A31E8 270F