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