Mario Toy Factory
Mario Toy Factory is the first plus world after the main story in Mario vs. Donkey Kong, being the plus counterpart to Mario Toy Company. Being the first plus world in the game, the objective is different. Mario must safely lead a Mini-Mario that is holding a key to an exit. Due to the change of objective, there are only seven levels in each plus world as Mario guides one of the six Mini-Marios through one of the six normal levels each, making Mini-Mario levels redundant.
Mario Toy Factory is the only plus world to not have "PLUS" after its name, instead having a different name from its normal world counterpart.