Press C during game play, then enter one of the 
following passwords.

Level Password  
--------------
1     0000  
2     HTDC  
3     CLLD  
4     LBKG  
5     XDDJ  
6     FXLC  
7     KRFK  
8     KLFB  
9     DDRX  
10    HRTB  
11    BRTD  
12    TFBB  
13    TXHF  
14    CKJL  
15    LFCK