Let's say you didn't have a Nintendo, but you really wanted to play Nintendo games like Super Mario and Zelda! Well, you can't, but you can play similar games! I invite you to think of your own Atari 2600 alternatives to NES games in the replies! Here are a few of mine:
Instead of Zelda, play Adventure!
Instead of Super Mario Brothers, play Pitfall!
Instead of Punch-Out, play Boxing!
Instead of Metroid, play Montezuma's Revenge!
Instead of Rad Racer, play Fatal Run or Enduro!
What are some you can think of?