Layer-Cake Desert is the sandy second world of New Super Mario Bros. U. To the south is the grassy first world, Acorn Plains. To the northeast is the snowy fifth world, Frosted Glacier and the lava themed eighth world, Peach's Castle.Peach's Castle. To the east is the mountainous sixth world, Rock-Candy Mines and the cloudy seventh world, Meringue Clouds . To the southeast is the tropical third world, Sparkling Waters and the jungle themed fourth world, Soda Jungle. Morton Koopa and another Boom Boom hide here.