World 3 (New Super Mario Bros.)

Somehow Mario and Luigi ended up in an island in World 3 of New Super Mario Bros.. The island had the the first Ghost House in the game. The boss of this world was Cheepskipper, the giant Cheep Cheep.

Mario and Luigi can beat the game without needing to beat this world because if Mini Mario or Mini Luigi defeats Mummipokey in World 2, he will go to World 4 instead.

Enemies Introduced

 * Mega Cheep-Cheep
 * Cheep-Chomp
 * Skeeter
 * Boo
 * Amp
 * Blooper
 * Whomp
 * Super-Whomp
 * Blooper Baby
 * Splunkin