At the password area type
BCDF or GYLM for Bonus levels
Hear Sound Effects
When the LucasArts logo appears on-screen immediately press the L or R buttons. If you press L, you will hear a person scream. If you press R, then you will hear a dog bark.
Level codes
At the Password section use the following codes
Level
5=VHRV
9=PBGG
13=BFCB
17=BKYZ
21=VXBB
25=XYLZ
29=YLZD
33=WJQK
37=BZVG
41=BRPK
45=VLHX