World 7 (Super Mario Bros.)

World 7 is the seventh world in Super Mario Bros. This is the second-to-last world in the game. This world has four different level types: One at ground, one underwater level, one set at seaside, and the final level being a castle as usual.

Trivia

 * Hamma Jamma mentions "World 7-1" as his grandfather's "'hood" in Paper Mario: The Thousand-Year Door, indicating that he grew up as one of the level's four Hammer Bros.
 * Worlds 7-2 and 7-3 are duplicates of Worlds 2-2 and 2-3, respectively, except that 7-2 has more Bloopers, and 7-3 has Koopa Troopas in addition to the jumping Cheep Cheeps. The famous Minus World glitch also leads to an exact replica of World 7-2, but with a different name and without any Flagpoles.

Mondo 7 (Super Mario Bros.)