The same tech demo that became popular. If you believe the words of the author, he just decided to check on the configuration of his PC will look smooth scrolling.
In fact, it's the same Mario with mushrooms (which is fatal), turtles and pipes. Only six are not particularly long levels. Every detail of the gameplay of the original Super Mario Bros. carefully observed. Sometimes there are small slowdowns, not particularly disturbing. The possibility of two-player games, and save are present.
Graphic (VGA, 320x200) game looks great - from the official games on the SNES is virtually identical. And I will not say that this is the work of one person.
Soon there appeared works on an improved engine (Charlie the Duck and Sint Nicolaas), the second life of a pirate floppies and collections, playing the game tiger woods... And after all, what is most interesting at the time, Nintendo itself didn't release on the PC neither port on the adventures of Mario with consoles. All that could at that time to settle for players on computers, the collection of logic games and arcade Mario Bros. Therefore, the reason for the popularity of a platform is clear. Overall - a great example of how the engine can actually inspire, not only in technical terms. Sorry, not included level editor - so Mario would be more popular.
Not sure how to pass your time, why not play our classic videogame Mario online? And the best part, it is for free!