Superman

Easy mode:
Hold Fire and power on the Atari 2600. Release the button after approximately two seconds. In this mode, Superman will not transform into Clark Kent, and the bridge will not explode, although its pieces will still appear in the subway. Simply capture Lex Luthor and his men and return to the Daily Planet to complete the game. Note: This trick will not work on later versions of the cartridge.

On later versions of the cartridge, when you drop to the phone booth press Fire when you are at the same level of elevation as a subway entrance and press Select. Wait for the screens to cycle to a subway entrance and move the Joystick to put you in the subway. Note: If you press Up it will look like Superman is trying to fly but keeps getting yanked down by gravity. In this state you can walk left or right or fly downward until you get to the bridge screen where you will automatically regain your powers without the bridge exploding.
Information in this section was contributed by Steven Lucas.

Quick win:
Begin game play and move to the center of the screen to the approximate location of the Daily Planet entrance. Press Select and wait until the Daily Planet. If your character is aligned correctly, move to enter the Daily Planet and win the game.