Level Passwords:
Use these codes on the Password menu:

Level 1-1-1: MSW5
Level 1-1-2: BK8V
Level 1-2-1: 69NN
Level 1-3-1: GFVY
Level 1-3-2: V34K
Level 2-1-1: 94HR
Level 2-1-2: ZWLG
Level 2-1-3: SP??
Level 2-2-1: KDY3
Level 2-3-1: Y27F
Level 2-3-2: 6!2N
Level 2-3-3: BHBV
Level 2-4-1: MQR5
Level 2-4-2: 3YTK
Level 2-4-3: ?6DS
Level 2-5-2: 6?SR
Level 2-5-3: SNJ5
Level 3-1-1: MNW9
Level 3-2-1: BF8Z
Level 3-2-2: 65NS
Level 3-2-3: YVKK
Level 3-2-4: KGTY
Level 3-3-1: SDR6
Level 3-4-1: Z3ZB
Level 3-5-1: 9?5M
Level 3-5-2: FC73
Level 3-5-3: NL2?
Level 3-6-1: VXBG
Level 3-6-2: YWKJ
Level 3-6-3: GJQZ
Level 3-7-1: KHP2
Level 3-7-2: 313K
Level 4-1-1: ?!JT
Level 4-2-1: ML17
Level 4-3-1: YXFC
Level 4-4-1: GHV1
Level 4-5-1: VW4C
Level 4-6-1: YX!F

Cheats:
Input YZTP - Begin at 1-1-2 with infinite lives.
Input MS5W - Begin at 1-2-1 with infinite lives.
Input BKZ4 - Begin at 1-3-1 with infinite lives.
Input M!K3 - Begin at the start of the game with unlimited lives.
Input MS91 - Begin at 1-3-1 with infinite lives.
Input 94MC - Begin on stage 2-2-1 with infinite lives.
Input MSMC - Activates debug mode; push L, R to choose the function and level.
Input FG6Y - Red Costume for Mr. Incredible.
Input 69DD - Invincible.