Unlimited Web
Select "Options" on your title screen, and set the controls to "A = Punch," "B = Jump," and "C = Web." Set the difficulty to easy and start the game. Your web bar will not decrease while playing.
Boss Passwords
Enter the following passwords to fight the corresponding boss: Enter "Arbogast" to fight Dr. Octopus. Enter "Cowboy36" to fight Electro. Enter "Totally2" to fight Lizard-Man. Enter "Permanent" to fight Mysterio. Enter "Mechanic" to fight Sandman.
Level Passwords
Enter the following passwords to go to the corresponding level: Enter "Electro" for Level 2. Enter "Wallaby" for Level 3. Enter "Gallon66" for Level 4. Enter "Falcon499" for Level 5. Enter "Helpinhand" for Level 6. Enter "Public45" for Level 7. Enter "Kidney2" for Level 8. Enter "Pencil6" for Level 9.
Endings
To achieve the bad ending, lose to the Kingpin in the final battle. To achieve the second bad ending, defeat the Kingpin after Mary Jane falls into the fire pit. To achieve the good ending, defeat the Kingpin before Mary Jane falls into the fire pit.