Cheat:
 Put "M0MY" as your password and you will be able to use F5 
 and F6 to choose the level while you are playing.
 (It doesn't work in all versions)
 
 Here are all level codes:
 
 STRT   VLCN   BTRY   8BLL 
 GR8T   QCKS   JNKR   TRDR
 TLPT   PHR0   CBLT   FNTM
 GRND   C1R0   HOPP   WRLR
 LLMO   SPKS   SMRT   TRPP
 LL0T   JMNN   V8TR   TFFF
 TRSS   TTRS   NFL8   FRGT
 CVRN   JLLY   WKYY   4RNH
 BBLS   PLNG   CMBO   MSTR
 
 Extra: