Super Mario Land
This is about the game, Super Mario Land. For the place, go here.
Super Mario Land is a game for the Nintendo Gameboy. Unlike preceding Mario games, The game takes place in Sarasaland and not in the Mushroom Kingdom. SML also introduced the player and Mario to Daisy, this game's damsel in distress. Tatanga is the main villain, and the enemy names(even of familiar Goomba-looking creatures) are different (it should be noted that most of them are simply given their original Japanese names as opposed to the English ones). The most probable reason for the vast amount of changes is that the game wasn't made by Shigeru Miyamoto, but rather his mentor, Gunpei Yokoi.
The game is the first of three Super Mario Land games, followed by Super Mario Land 2: Six Golden Coins and Wario Land: Super Mario Land 3.
The Story
Tatanga, an evil alien, kidnaps Daisy. Mario steps up to make his way through the four worlds - Birabuto; Muda; Easton; and Chai - and rescue the princess.
It is revealed in the sequel, Super Mario Land 2: Six Golden Coins, that the events in this game were merely a diversion created by Wario while he took over Mario's castle.