"Super Mario Land (スーパーマリオランド Sūpā Mario Rando) is a platforming video game developed by Nintendo for the Game Boy handheld game console.
The game launched one main sequel that shares the Mario Land title as well as the first Wario Land game, which later launched a franchise of its own. Super Mario Land 2: 6 Golden Coins the sequel to the game including better graphics and including a new character called Wario. Wario Land: Super Mario Land 3, takes Wario into his own adventures, without Mario."
Source: Wikipedia, "Super_Mario_Land", available under the CC-BY-SA License.