Enter these at the Secret Code screen.

Effect	Password
??? Letter	Dr. Wani, Lily, Dr. Wani, Frogger
Dr. Wani's Letter	Lumpy, Berry, Lumpy, Finnius
John's Letter	Finnius, Lily, Berry, Dr. Wani
Opart Letter	Berry, Lumpy, Frogger, Lumpy
Wani Holding Company Letter	Lumpy, Frogger, Frogger, Berry