The objective of Mario Forever is the same as Super Mario Bros: you must race through the Mushroom Kingdom, survive the attacks of Bowser’s henchmen, and rescue Princess Peach. As Mario, you must traverse across the 8 worlds to save the princess and free the kingdom from evil.
The gang has also kidnapped Princess Peach to use as leverage against Mario. The Mushroom Kingdom has been invaded by Bowser and the Koopa Troopas, turning many of its citizens into inanimate objects. It does, however, maintain the original story. This fangame was developed by Softendo to allow players to play the original Super Mario Brothers game with improved graphics and new features. 3: Mario Forever is a fan translation of the original Super Mario Bros game included in the Super Mario All-Stars set.
