Level Select and Secret Level 12
     On the 2nd level, go to the 3rd fireplace, skip all balloons, and
go  to  the  front  of the fireplace. Now press Up, Up, Down, Down, B,
Right, Left. It will ask you "level skip?", select yes.

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