On the 2nd level, when you go to the third fireplace, skip all of the balloons
 and go to the front of the fireplace. Enter this code:

 Up, Up, Down, Down, B, Right, Left

 and then the screen will say "level skip?" select yes.

 Levelcodes:

 2 - TQMMY QK
 3 - RQVDHJVV
 4 - BVBYFJND
 5 - RJDBCVRT
 6 - VNGBLJCV
 7 - BJGSMVSH
 8 - LJTBWQQD