Last part of difficult mode:
Enter A3, B5, C3, D3, E5 as a password.

Level	Password
Starman	A3, A6, B2, C1, E5
Stoneman	C3, D6, E2, E4, F1
Napalmman	A5, C1, C3, C4, D3
Brightman	A4, B4, B5, C1, F6
Dr. Wiley's Castle	4A, 4B, 5B, 1C, 6F