The following are known GameShark Codes for Mary-Kate and Ashley: Crush Course on Sony Playstation (PS1).

• Joker Command
  D009A8FA ????
• Always Win Carnival Games
  3017CAFC 00FF
  3017CCFE 00FF
  3017CB08 00FF
• Infinite Exposures (Journalism)
  300C179C 000C
• Infinite Time (Journalism & Marine Biology)
  30091F01 00D0
• Max Stars (Beach Tryouts)
  30151AD6 0080
• Max Stars (Field Tryout)
  301972C2 0080
• Hit Select For Instant Win (MB)
  D009A8FA FFFE
  800C1B78 0000

Always 1 Stroke Codes

• Time Lapse
  3009357C 0001
• Get Connected!
  3009357D 0001
• Pinball
  3009357E 0001
• Atom Smasher
  3009357F 0001
• Refrigerator
  30093580 0001
• Fun Factory
  30093581 0001
• Great Pyramids
  30093582 0001
• Stone Henge
  30093583 0001
• Great Wall
  30093584 0001
• Mayan Temple
  30093585 0001
• The New World
  30093586 0001
• The Capitol
  30093587 0001
• All Holes
  50000602 0000
  8009357C 0101
  Note: GameShark 2.2+ Required