While many of us enjoy indulging in retro classics on a regular basis, whether experiencing them for the first time or starting a 20th playthrough, there are those with a passion for past generations of systems and games that take the hobby further. Case in point is user Sprybug from atariage.com, who has reproduced World 1-1 of Super Mario Bros. to run on the Atari 2600 engine.
While this may seem simple, it should be noted that the 8-bit NES had a very different set of capabilities to the Atari 2600, which was a much older machine. Seeing the iconic first stage with Atari graphics and sound effects is rather fun, even if there are some necessary changes and amendments to deal with limitations of the engine. It may not provide classic, refined controls or smooth gameplay, but it's an achievement nevertheless.
Check out the AtariAge links to follow the project, while the video below will give you a taste of how it's shaping up.