Play as Ralph
Password: LVPVS

Play as George
Password: SM14N

Play as Lizzie
Password: S4VRS

Play as Myukus
Password: N0T3T (Note: 0 is zero)

Play as Alternate Myukus
Password: B1G4L

Cheat Options
Password: BVGGY
This will unlock a Cheats selection of the Options menu.

Play as Noob Myukus
Password: SRY3D