Master code:
Select the "Enter Secrets" option at the main menu, then enter BILLHUDSON as a code to unlock all levels, trading cards, and cheats.

Power-up:
Select the "Enter Secrets" option at the main menu, then enter EBSTORE as a code.

The Utonium Chateau level:
Select the "Enter Secrets" option at the main menu, then enter BEATBRICK as a code to defeat the red Rowdyruff Boy Brick and gain access to the girls' and Professor's suburban home.

Bonsai Garden level:
Select the "Enter Secrets" option at the main menu, then enter DUSTBOOMER as a code.

Big Billy trading card:
Select the "Enter Secrets" option at the main menu, then enter KABOOM as a code.

Broccloid Emperor trading card:
Select the "Enter Secrets" option at the main menu, then enter MOJOJOJO as a code.

Butch trading card:
Select the "Enter Secrets" option at the main menu, then enter ROWDYRUFFS as a code.

Fuzzy Lumpkins trading card:
Select the "Enter Secrets" option at the main menu, then enter RZONE as a code.

Grubber trading card:
Select the "Enter Secrets" option at the main menu, then enter GRUBBER as a code.

Little Arturo trading card:
Select the "Enter Secrets" option at the main menu, then enter TARGETPOWR as a code.

Mrs. Keane trading card:
Select the "Enter Secrets" option at the main menu, then enter SEARSRULE as a code.

Powerpuff Girls trading card:
Select the "Enter Secrets" option at the main menu, then enter GOCIRCUIT as a code.

Snake trading card:
Select the "Enter Secrets" option at the main menu, then enter SQUID as a code.

Townsville Dump trading card:
Select the "Enter Secrets" option at the main menu, then enter AMOEBABOYS as a code.

Bubbles graphics:
Select the "Enter Secrets" option at the main menu, then enter UTONIUM as a code.

Blossom graphics:
Select the "Enter Secrets" option at the main menu, then enter POKEYOAKS as a code.

Mayor graphics:
Select the "Enter Secrets" option at the main menu, then enter OCTIEVIL as a code.

Hint: Avoid getting hurt:
Use Run and Punch to avoid getting hurt.