Play as Ralph:
Enter LVPVS as a password.

Play as George and Ralph:
Enter SM14N as a password.

Play as Lizzie, George, and Ralph:
Enter S4VRS as a password.

Play as Myukus:
Enter N0T3T as a password.

Play as alternate Myukus:
Enter B1G4L as a password.

Play as Noob Myukus:
Enter SRY3D as password.

Unlock all characters:
Enter GOT3T as a password.

Cheat options:
Enter BVGGY as a password to unlock a "Cheats" selection on the options menu.