Aladdin: Take mom’s advice and pick up after yourself! Especially the magic rug, which looks like an innocuous piece of paper in the Super Nintendo version of the game. As you try to rescue princess Jasmine, you can use the mat to slow occasional falls.

Mortal Kombat: In case you’re still missing out on the full-gore version of the Sega game, enter the code ABACABB at the Codes of Honor screen. (ABACABB is another software in-joke; it recalls the name of a song by the old rock group Genesis.) The password opens up a more violent version of the game, complete with decapitations, flying spurts of blood and realistic screams.

NHL Stanley Cup: The wrist shot is one of the most lethal scoring weapons. Buffalo player number 89 and Pittsburgh player number 65 are masters of the move. just like real life, the closer you are to the goal, the better your chances for a score.

Super Mario All-Stars: As Mario runs from challenge to challenge in the The Lost Levels portion of the SNES game, occasional mushrooms add bonus points. But stay away from the purple-and-black fungus ones: they pack a poisonous punch.