Well here's something to make every Mario fan sh*t his pants. According to a well known gaming site, 18 years after the release of Super Mario Bros. 3, someone supposedly found a hidden goal, taped the gameplay and released it on the Internet for the whole world to marvel at his/her discovery. Check out the video below and do say something if this is not the first time you see it.

It sure looks genuine though. The setting pretty much takes after "Negative 1" in the original Super Mario Bros., as Destructoid.com themselves reckon. It's supposedly done by timing your jump into the Tanooki Suit, resulting in Mario getting propelled into the wall and the secret passage way implicitly. But we'll leave you to decide whether this easter egg is real or not.

As in most Mario games, Super Mario Bros. 3's plot is minimal, existing mainly to serve the functions of the gameplay.

In Super Mario Bros. 3, Mario and Luigi are on a mission to rescue the seven kings of the seven worlds which neighbor the Mushroom Kingdom. Each of the kings has had his magic wand stolen by one of the Koopalings, who turned them all into different types of animals. It's up to the Mario Bros. to enter the seven worlds, make their way to the Koopalings' airships, and take back the wands.

However, as Mario and Luigi learn at the end of world 7, these attacks are merely a diversion planned by Bowser, to get Mario and Luigi out of the way while he kidnaps Princess Toadstool. So it's up to Mario and Luigi to save the Princess once again.

A similar version appears on the Game Boy Advance as Super Mario Advance 4: Super Mario Bros. 3. It is not completely faithful; there are several changes to the levels. It includes the updated original Mario Bros. and the ability to connect with the link cable for multiplayer battles. Newly created levels based on Super Mario Bros. 3, and demonstrations of how to complete certain levels can be downloaded through e-Reader cards.

Only two sets of cards were released and the e-Reader was discontinued shortly thereafter in the United States (the e-Reader was never released in Europe, as such, the e-Reader option in the game's main menu was removed). The game also features voice acting for Mario and Luigi, provided by Charles Martinet. It is similar to Super Mario 64, with Mario (or Luigi) shouting phrases such as "Mamma mia!" as they die, for example.
(Wikipedia)