Level select:
Enter SCBCRS as a password. Press Start to pause game play to display the level selection screen. Note: The game cannot be completed normally when this code is enabled.

Expert mode:
Enter MRRYPN as a password.

Secret areas:

Move to the top left of level 1 and punch at this location to warp.
Find the gold fountain on level 8. Stand towards the middle and left of the screen and throw an opponent toward the left side.
In the police station as Spider-Man, go to the very last door. Climb your web directly in front of it and drop down to find the secret room. Note: Hold Up when dropping down.
At the beginning of level 2, do a jump kick at the upper left hand corner of the screen to reach a secret room.

Level Password
5 DCCPMH
11 MDRKJP
17 STSPPC
16 QPMJCV