Level Skip
Hold Down + A + X + L in that order at the options menu. The clouds will scroll faster to confirm correct code entry. Press Select during game play to jump to the next level.
Level Passwords
Level Password
2 CFBMGM
3 DFBMHM
4 FFBMJM
5 GFMLBM
6 HFMLCM
7 JFKLBM
8 KFJLBM
9 LFJLCM
10 MFHLCM
11 NFGLCM
12 PFDLBM
13 RFDLCM