Codes:

 LEVEL 1: TOY FACTORY    (none)
 LEVEL 2: UNDERGROUND    DWTHPL
 LEVEL 3: RAINY FORES    EHTC2C
 LEVEL 4: SPOOKVILLE     P3QPUR
 LEVEL 5: THE MANSION    QXFNXP
 LEVEL 6: HER DREAMLAND  QVVHBX
 LEVEL 7: FROSTY LAND    QWHYAE
 LEVEL 8: CANDY HILL     P8RW4U