Game Shark Codes:

Infinite Credits - 800BDEA5 0005 
No Credits - 800BDEA5 0000 
Unlock All Bonus Characters - 810C632E FFFF 
Unlock All Courses - 
          810CCDF2 0B00 
          810CCDF4 0B00 
          810CCDF6 0B00 
Gold Medals Won Modifier P1 - 810D8EF0 ???? 
Level Modifier - 800CCF69 00?? 
Start on Level Modifier - 
          D00CCF69 0000 
          800CCF69 00?? 
Always Have Points Modifier P1 - 810D8EE0 ???? 
Always Have Points Modifier P2 - 810D8EE2 ???? 
Always Have Points Modifier P3 - 810D8EE4 ???? 
Always Have Points Modifier P4 - 810D8EE6 ???? 
Have Cheats Modifier 1 - 800CCF89 00?? 
Have Cheats Modifier 2 - 800CCF8A 00?? 
Have Cheats Modifier 3 - 800CCF8B 00?? 
Enable Cheats Modifier 1 - 800CCF91 00?? 
Enable Cheats Modifier 2 - 800CCF92 00?? 
Enable Cheats Modifier 3 - 800CCF93 00?? 
Quantity Digits to Accompany Cheat Modifier 1 Codes - 
          01 - 2X Turbo Time 
          02 - Blue Balls 
          04 - Explosive Mode 
          08 - Full Turbo 
Quantity Digits to Accompany Cheat Modifier 2 Codes - 
          01 - Ice Mode 
          02 - Slime Mode 
          04 - Just Bombs 
          08 - Sudden Death 
          10 - Bomb Physics 
          20 - No Weapons 
          40 - Roll Mode 
          80 - Bomb Pickups 
Quantity Digits to Accompany Cheat Modifier 3 Codes - 
          01 - All Characters 
          02 - All Worlds 
          04 - Level Select 
          08 - Mix 'N' Match 
          10 - Pencil 
          20 - Fat Mode 
          40 - Tiny Mode 
          80 - Dark City