It didn't have to be a mirror image; it could also be an unmirrored copy. See, for example, the first screen of the second row of the map to Adventure: http://

It didn't have to be a mirror image; it could also be an unmirrored copy. See, for example, the first screen of the second row of the map to Adventure: http://www.vgmaps.com/Atlas/Atari2600/Adventure-Variation2.png http://www.vgmaps.com/Atlas/Atari2600/Adventure-Variation2.p...