The following are known Action Replay Codes for Scooby-Doo! Classic Creep Capers on Nintendo 64 (N64).

Device Compatibility: Action Replay & GameShark

Master Code – Must Be On
F107D9B0 0000
EE000000 0000

Inf Courage
810BB096 0007

Have All Items
811BA010 0101
811BA012 0101
811BA014 0101
811BA016 0101
811BA018 0101