Take a look at Super Mario, or even PacMan, or Arkanoid.
How are their levels made, do they created a simple level editors to visualize them, or they designed them by hand (directly with code)?
closed as not a real question by BlueRaja - Danny Pflughoeft, 21st Century Moose, Byte56♦, bummzack, Sean Middleditch Feb 10 '13 at 20:52
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