Go to the "Password" screen at the main menu to enter these passwords.

Effect	Password
Caves	SSCLJEE6WWWILS8VM76Q
Dodgey City	CVC3TEEALDWILOIYMST4
Factory Reception	DGHF4FE6WWLILRW8MM19
No Mans Causeway	SSHF4EE6WW8ILSW8M7TW
Space Station	DGHFFFE6WWLJLRWFIDOL
The Border	C3ZETERADEWILLIAMS6X