http://www.netrover.com/~timt/cheats/n/nebulustowertopler.html (Amiga Plus Extra No. 5/97, 05/1997)On the title screen, type "HELLOIAMJMP" for infinite lives. Also, pressing 'F1'-'F8' you can access any of the towers. You can do the same with the second group by accepting the second mission before typing in the password.