Enter these at the PASSCODE screen off the main menu.

Effect	Password
Start on World 1, Level 2	GPTJL
Start on World 2, Level 1	QWYRW
Start on World 2, Level 2	SMDBC
Start on World 2, Level 3	FHFMB
Start on World 3, Level 1	NKVPZ
Start on World 3, Level 2	DFMWX
Start on World 3, Level 3	BCMVG
Start on World 4, Level 1	STBBH
Start on World 4, Level 2	TBGNT